I felt it before I saw him.
Not a sound, not a movement—just a sudden wrongness in the air, like two radio signals bleeding into each other. The coffee shop around me blurred at the edges, conversations fracturing into static. My hands went cold.
Lucian was close.
I set down my cup, trying to look casual. Across the room, a guy in a hoodie stood up too fast, knocking his chair over. He looked around, disoriented, like he'd forgotten where he was.
The resonance spiked.
My system flared to life, overlapping messages cascading down my vision in a format I'd never seen before—half my UI, half something else. Foreign syntax. Different colors. Text that looked almost like mine but slightly wrong, like a reflection in warped glass.
CROSS-SYSTEM PROXIMITY ALERT
External field detected: 4 meters.
Resonance interference: High.
Recommendation: Increase distance immediately.
Beneath it, in a different font:
FIELD OVERLAP DETECTED — OPERATOR NEARBY
That wasn't my system's voice.
The guy in the hoodie stumbled, caught himself on the table. His eyes were unfocused, pupils dilated. Someone nearby asked if he was okay. He didn't answer.
I moved toward him without thinking.
"Hey," I said, keeping my voice low. "You need to sit down."
He looked at me, but he wasn't seeing me. His face was pale, a thin sheen of sweat on his forehead.
"I can't—" His voice cracked. "Something's wrong."
The dual notifications kept scrolling.
RESONANCE THRESHOLD EXCEEDED
Collateral bleed: Confirmed.
Third-party exposure: Active.
Warning: Uncontrolled interference may cause lasting effects.
And beneath, in that other voice:
ACCEPTABLE INTERFERENCE RANGE — NO ACTION REQUIRED
That wasn't my system. That was Lucian's.
I grabbed the guy's arm, steadying him. His skin was clammy, pulse fast. He was shaking.
"Look at me," I said. "Focus."
"Can't think straight." He blinked hard, like trying to clear a fog. "What's happening?"
Behind me, the door opened. I didn't need to turn around to know who it was. The resonance sharpened, the dual UI solidifying into something almost readable. My system and his, occupying the same space. Competing for the same frequency.
Lucian stopped three feet away.
"Interesting," he said. "You're still here."
I didn't let go of the guy. "Call it off."
"Call what off?" Lucian's tone was mild, curious. "I'm just standing here."
The notifications flared again.
HOSTILE PROXIMITY CONFIRMED
System interference escalating.
Target: Third-party observer.
Recommendation: Withdraw to prevent permanent damage.
My jaw tightened. "He's not part of this."
"He was in range." Lucian tilted his head. "That makes him part of it."
The guy sagged against me, legs buckling. I caught him, easing him into a chair. His breathing was shallow, erratic. People were starting to stare.
"You're doing this on purpose," I said.
"I'm testing a hypothesis." Lucian stepped closer. The resonance doubled, my vision stuttering like a broken frame. "Systems interact. Sometimes people get caught in the overlap."
"That's not an interaction. That's friendly fire."
"Is it?" He glanced at the guy, then back at me. "Or is it just poor positioning?"
I wanted to hit him. Wanted to shove him out of the shop, out of range, out of this guy's life. But the resonance was too strong. Moving closer would make it worse.
My system pulsed.
ENTITY TRACE ESTABLISHED
Third-party exposure logged.
Mark applied: Resonance signature.
Effect: Trackable within 50-meter radius for 72 hours.
I stared at the notification. Then at Lucian.
"You marked him."
"We marked him." Lucian's smile was thin. "Your system participated. Check your logs."
I did. He wasn't lying. The trace carried both signatures—his and mine. A shared marker, a resonance tag embedded in someone who'd been standing too close when two systems occupied the same space.
The guy's breathing was starting to even out, the worst of the interference fading. But the mark remained. A signal that said: This person has been near a system user. This person is now visible.
"Why?" My voice came out flat.
"Because now I know where you've been." Lucian turned toward the door. "And who you've been near."
He left.
The resonance collapsed, the dual UI vanishing as suddenly as it had appeared. My system's voice returned, solitary and cold.
WITHDRAWAL DETECTED
Interference reduced.
Collateral mark: Permanent for duration.
Note: Entity may be traced by external operators.
The guy sat up slowly, rubbing his face. "What the hell was that?"
I didn't have an answer. Not one that would help.
"Panic attack, maybe," I said. "You should get some air."
He nodded, still dazed, and stumbled toward the exit. I watched him go, the system's notification lingering in my vision.
Entity trace established.
Lucian hadn't just tested a hypothesis. He'd turned a random bystander into a beacon. And because I'd been standing there, because our systems had overlapped, I was complicit.
I sat down, hands shaking.
The resonance was gone. The mark wasn't.
And somewhere in the city, Lucian was learning exactly where I'd been, and who I'd tried to protect.