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The walk back through the drainage culvert was slower.
Adrenaline has a half-life, and when it burns out, the body demands payment in full. Min-Jae was dragging his heels through the ankle-deep mud, his breathing ragged and uneven. The taped handle of his baseball bat hung loosely from his right hand, the aluminum head leaving a shallow, continuous furrow in the silt behind him.
Kael walked four paces ahead, his pace unhurried, measured, and deliberate. His left forearm was swollen where the beast's talon had struck, the canvas of his sleeve stiff with dried black fluid, but his posture hadn't slipped an inch.
"Hyung," Min-Jae called out softly, his voice echoing flatly against the curved concrete pipe. "How long does it take?"
Kael didn't break stride. "How long does what take?"
"The shaking." Min-Jae stopped for a second, holding out his left hand in the gloom. His fingers were spasming in tiny, erratic jerks. "In the moment, when that gate came down, I felt like I could have picked up a car. Now my knees feel like someone scooped the marrow out with a spoon."
Kael slowed his steps, matching the younger man's pace so they walked side by side.
"An hour. Maybe two, if you drink enough clean water," Kael said. His tone was even, devoid of impatience or false bravado. "Your nervous system just fired every reserve circuit it had to keep you alive. That crash isn't weakness, Min-Jae. It's chemistry. If you don't learn to respect the fatigue, you'll misjudge your reaction time during the next engagement, and that's usually when people get careless."
Min-Jae rubbed his face with his dirty sleeve, leaving a smudge of soot across his cheek. "You don't shake."
"I did," Kael answered quietly. "Fifteen years ago, on a roof in Kandahar when the first mortar landed thirty feet from my observation post. I spent twenty minutes throwing up dry bile behind an air conditioner unit while my team lead checked the radio frequencies. You learn to control the outward sign because showing it doesn't solve the problem in front of you. That's all experience is—learning what not to waste energy on."
Min-Jae let out a slow breath, looking at Kael with a mixture of relief and confusion. "I thought... I don't know. I thought you were just born without normal nerves."
"Nobody is born without nerves," Kael said, his eyes scanning the dark intersection ahead where the culvert met the service line. "The ones who pretend they don't feel fear usually die in their first month because they take stupid risks to prove something to an empty room. Fear tells you where the threat is. Courage is just doing the math anyway."
They reached the rusted iron rung ladder leading back up to Platform 2.
Kael climbed first, his boots testing each rung before committing his weight. When he pushed the heavy fire door open, the low murmur of the station concourse drifted down the stairwell.
---
The concourse had changed while they were gone.
It wasn't an army base, but the panic had settled into a functional, uneasy quiet. Jin-Hyuk had set up a perimeter using overturned steel benches and plastic folding tables from the station office, creating a controlled funnel leading to the main platform. Two men with rebar javelins stood by the opening, their eyes bloodshot, watching the shadows near the stairs.
When Kael and Min-Jae stepped through the frame, both guards snapped their heads around, raising their makeshift spears before recognizing the silhouette.
"Hold up," one of them whispered, his voice cracking. "It's the Captain."
Jin-Hyuk came out of the station master's office immediately, wiping his face with a damp hand towel. His eyes went straight to the heavy canvas bag slung over Kael's shoulder, then to the massive dent in Min-Jae's bat.
"The gate?" Jin-Hyuk asked. He didn't waste time with pleasantries. The strain of managing sixty terrified civilians had carved deep lines into the corners of his mouth.
"The sluice is down," Kael said, unhooking his tactical belt and setting it on an empty plastic crate. "The nest is crushed, and we drove two five-foot steel pins through the manual gear housing. Nothing larger than a field rat is coming up through the southern drainage line."
A visible shudder of relief passed through Jin-Hyuk's shoulders. He leaned back against the tiled ticket counter, letting his head drop for a brief second.
"God," Jin-Hyuk muttered. "That buys us time."
"It buys us forty-eight hours," Kael corrected, his voice cutting through the man's brief relief with calm precision. "The water level in the culvert dropped because the gate closed. That means the river pressure is building on the outside. Eventually, the silt will shift, or something bigger will come looking for the nest we just wiped out. We don't sit here and congratulate ourselves. We use the window."
Jin-Hyuk straightened up, his professional instincts kicking back in. "What do you need from my end?"
"How much food do we have left in the kiosks?"
"If we keep everyone on two hundred calories a day—mostly dry biscuits, canned tea, and whatever instant noodles didn't get crushed in the initial rush—we have about three days. Water is worse. The emergency cistern on the mezzanine is down to a third. The pressure in the municipal pipes died completely about four hours ago."
"Then the station is a dead end," Kael said calmly. "A fortification without a sustainable water source isn't a shelter; it's a tomb with a locked door."
"You want to go to the surface," Jin-Hyuk said, his eyes narrowing. "Captain, the people up there... we can hear things moving through the streets during the day. Things that sound like heavy construction equipment ripping through asphalt. If we move seventy people into the open, half of them will scatter the first time a car alarm goes off."
"We're not moving the civilians," Kael replied, his tone steady and practical. "Not yet. Min-Jae and I are going up to establish a supply corridor to the pharmacy and the commercial district three blocks north. We need medical supplies, heavy tools, and non-perishable rations. While we're gone, you organize the able-bodied adults into three shifts. Fortify the northern pedestrian exit, inventory every piece of metal longer than two feet, and make sure nobody touches the clean water without your direct sign-off."
Jin-Hyuk looked at him for a long moment, then nodded. "Understood. But take someone else with you. Min-Jae looks like he's about to collapse."
"He's resting for three hours," Kael said. "After that, he'll be fine. Yuna is waiting behind the tarp?"
"Yeah. She hasn't slept. She's been boiling water and re-dressing bandages all morning."
Kael picked up his canvas field bag and walked toward the medical partition.
---
Behind the blue tarp, the atmosphere was quiet, smelling of clean linen, iodine, and boiled water.
Yuna was sitting on a low stool beside an elderly woman whose arm was bound in clean white splints. She was checking the woman's pulse with two fingers on the radial artery, her head tilted slightly, counting the beats under her breath.
She looked up as Kael entered.
Her eyes, shadowed with deep exhaustion, immediately cataloged his condition: the swollen left forearm, the dried crust of black ichor along his neck, and the heavy canvas bag resting against his hip.
"Sit down," she said, releasing the old woman's wrist and standing up.
"The old woman first," Kael said.
"Her pulse is regular, and the fever broke an hour ago," Yuna replied, pulling a pair of stainless steel shears and a clean bottle of antiseptic from her kit. "Sit on the cot, Kael. Don't make me ask twice."
Kael sat down on the edge of the cot without another word.
Yuna stepped in front of him, took the hem of his torn left sleeve, and carefully snipped the canvas up to the shoulder. She peeled the stiff, bloody fabric away from his arm.
The skin along his forearm was discolored—a deep, mottled slate-gray that looked like bruised stone rather than human flesh. The dermal layer had thickened significantly, but underneath, the radius bone was visibly misaligned by two millimeters, swollen with localized fluid.
Yuna pressed her thumb gently against the center of the fracture.
Kael didn't flinch, though his jaw tightened a fraction of an inch.
"You took a direct impact from something weighing at least a ton," she said, her voice dropping into a focused, clinical murmur. "A normal human arm would have shattered into six fragments and severed the radial artery."
"The dermal hardening absorbed the blunt force," Kael said. "The bone cracked, but the periosteum held."
"The periosteum didn't just hold," Yuna said, looking up into his eyes. "It's calcifying at four times the normal rate. The bio-energy you've been absorbing is treating the fracture like an engineering defect and reinforcing it with denser mineral layers."
She reached into her medical bag, pulled out a small glass vial containing clear saline, and washed the dried ichor from his skin. Her fingers were cool, gentle, and steady.
"You're pushing your body too fast," she said quietly as she worked. "Human biology isn't meant to integrate this much foreign genetic material in forty-eight hours. Your cardiovascular system is operating under immense internal pressure. If your core can't regulate the intake, your heart will develop fibrous tissue."
"We don't have the luxury of a controlled clinical trial, Yuna," Kael replied, his voice calm, pragmatic, and unhurried. "The things outside aren't waiting for our bodies to adjust comfortably. They adapt through natural selection and pressure. If we don't match their rate of development, we become food."
"There is a difference between adaptation and self-destruction," she countered, meeting his gaze. "If you break yourself down before we find a secure long-term base, what happens to the seventy people out there? What happens to Min-Jae?"
Kael reached into his field bag with his good right hand and pulled out the fist-sized composite core from the river basin.
He laid it on the clean towel between them.
The crystal's inner storm of deep cyan and electric violet immediately cast sharp, cold light across the white fabric of the partition. The low, rhythmic hum coming from the stone was so dense that the surgical instruments on the metal tray vibrated with a faint, metallic ring.
Yuna stopped mid-motion. Her breath caught in her throat.
"That's..." She stared at the stone, her pupils widening. "The energy signature is split. It has two distinct wavelengths."
"Amphibian kinetic density on the outer shell, bio-electrical projection at the core," Kael explained. "Grade 2 Apex. It was maintaining an entire bio-electric field in the basin to stun prey."
Yuna slowly reached out, hovering her palm two inches above the crystal without touching it. Her awakened healing senses flared, a delicate emerald aura blooming across her fingertips as she read the energy output.
"This is too dense for direct human assimilation," she whispered, her brow furrowing with intense concentration. "If an unawakened person swallowed this, the electrical discharge would stop their heart in three seconds. But... if it's broken down, diluted through a sterile saline medium..."
She looked up at Kael, her eyes bright with sudden realization.
"I can use this to stabilize the entire camp," she said. "I can extract the pure bio-energy without burning through my own cellular reserves. I can treat thirty severe cases without collapsing from metabolic fatigue."
"That's why I brought it to you," Kael said. "Keep the core here. Use what you need to keep the wounded alive and build your own internal reserve. But don't drain the central violet node completely. When we go to the surface, we'll need that bio-electrical density to trade or power specific equipment if we find functioning tech."
Yuna carefully wrapped the glowing composite core in three layers of heavy cotton, dampening the light until it was only a soft, muted violet pulse beneath the fabric.
She turned back to his arm, placing both hands around his swollen forearm.
Her emerald light flared—not with the sputtering, desperate glow from the supermarket, but with a smooth, deep radiance powered by the residual energy in the room.
A wave of soothing, cool pressure washed through Kael's arm.
Inside his forearm, the fractured radius shifted with a microscopic, dull click as the bone fibers knitted together, perfectly aligned. The swelling subsided in seconds, the bruised gray skin smoothing out into a tough, seamless layer of reinforced tissue.
Yuna let out a long, controlled exhale, pulling her hands back. She wasn't trembling this time; her breathing remained steady.
"It's set," she said. "The bone is fully consolidated. But give the soft tissue an hour before you put full torque on it."
"Thank you," Kael said, flexing his fingers. The stiffness was gone; the grip strength in his left hand was completely restored, solid and responsive.
He stood up, picked up his combat rig, and began strapping the leather holsters across his chest.
Yuna watched him adjust the buckles. "You're going up to the streets today, aren't you?"
"In three hours," Kael said. "As soon as Min-Jae finishes his rest cycle."
"The surface isn't like the tunnels, Kael," she said, her voice dropping into a serious, cautionary tone. "The tunnels have bottlenecks, blind corners, and limited angles of approach. You can control the geometry down here. On the surface, the sky is open. You saw what flew over the city on the first day."
"I saw it," Kael said, his hand briefly touching the cold bronze chalice resting beneath his shirt.
He remembered the immense black wings, the sonic boom that had shattered concrete facades, and the terrifying certainty of the death vision locked inside the artifact.
"The dragon isn't hunting us," Kael continued calmly. "To a Grade 7 entity, seventy humans in a subway station are no different from ants under a sidewalk slab. It has objectives we don't understand yet. Our problem isn't the dragon today. Our problem is the Grade 2 and Grade 3 predators establishing territories in the high-rises."
"And if you run into another survivor group?" Yuna asked. "The scavengers we encountered near the museum weren't interested in talking."
"Then we establish clear boundaries," Kael said, checking the edge of his carbon-steel tanto before sliding it home into its scabbard. "If they want to trade resources, we trade fairly. If they want to test our perimeter, we show them why this station is still standing."
He turned toward the tarp exit, pausing for a moment in the opening.
"Get some sleep, Yuna. You've kept seventy people breathing for four days straight. Don't let yourself become the casualty you couldn't treat."
Yuna looked at him, a faint, tired softness touching her expression before she nodded. "Take care of Min-Jae up there. He trusts you more than his own instincts now."
"I know," Kael said quietly. "That's why I'm bringing him back."
He stepped through the blue curtain and walked into the concourse, his boots steady against the concrete floor, ready for the world waiting above.