Break hadn't dissolved into chaos, but it had loosened the room.
The courtyard was scattered with small pockets of activity. A few students were still arguing about yesterday's sparring results as if the outcome might change through repetition. Others practiced hand seals in uneven rhythm, some whispering the names under their breath as if saying them helped.
Kagehiro stood near the shade line of the building, watching the far side of the yard with his usual half-lidded expression. Across the courtyard, Itachi stood near the wooden railing, listening to two boys argue about yesterday's sparring. He wasn't participating, just watching, as if cataloguing who spoke first and who backed down.
"You're staring again," Daigo muttered, rolling his forearms. "You'll wear a hole through him."
"I'm not staring," Kagehiro replied. "I'm observing."
"That's just staring with extra steps."
Aoi ignored both of them. She stood a few paces away, carefully running through hand seals, correcting her finger placement each time before moving to the next. Her movements were neat, deliberate, almost stubbornly precise.
Roen watched them without speaking.
Daigo tried gathering chakra again, but it flickered outward unevenly along his wrist.
"Why does it spread like that?" he complained quietly.
"Because you push it," Aoi said without looking up. "You puff it out."
"I don't puff."
"You puff."
Roen's gaze shifted to Daigo's palm.
They weren't failing because they lacked chakra.
They were expanding it.
He lifted his own hand casually, as if stretching his fingers.
Instead of increasing flow, he held the same amount he normally would and forced it inward.
Not outward.
Not wider.
Inward.
The sensation changed immediately.
His palm felt heavier, like pressure had gathered into something smaller than it wanted to be. The chakra didn't flare it compacted. The containment required tighter control. His forearm tightened instinctively, and a faint burn crept toward his elbow as he resisted the urge to let it spread naturally.
His breathing shortened without him meaning it to. Harder to sustain. But it felt denser. The pressure felt more concentrated.
A pulse of strain ran through his wrist.
He released it before it destabilised.
No one noticed.
Daichi stepped outside then, hands clasped behind his back.
"Line up," he said.
The casual energy snapped back into order.
They formed rows quickly, some adjusting their spacing more carefully than others. Daichi walked down the line once, then stopped.
"Stance hold," he said. "Low guard. When pushed, you do not step unless you must. If you step without reason, you reset."
A few students groaned under their breath.
They lowered into position.
Daichi moved along the row, applying light but deliberate pressure to shoulders and forearms. Some students shifted immediately. Others overcorrected and stumbled a half-step too wide.
When Daichi pressed against Roen's guard, Roen compressed his stance and attempted the same inward tightening of chakra.
The effect was immediate.
His guard felt firmer.
But his thighs began to burn faster than usual. The tension that kept the chakra compact also pulled at his balance. His shoulders tried to rise. He forced them down.
Daichi increased pressure slightly.
The frame held.
But strain accumulated faster than before.
He was reinforcing the output.
His structure wasn't fully ready.
Daichi moved on.
Next drill: walking line while maintaining chakra in the palm.
Most students lost containment within a few steps, distracted by movement. Aoi held it longer than most, jaw tight with focus. Daigo's flickered but didn't collapse entirely.
Roen tried compression again mid-step.
The density made each movement feel heavier, as if his arm carried weight that wasn't visible. His breath tightened sooner. By the fifth step, he felt the instability begin to creep upward from his legs.
He released before it spilled.
Noted.
Stronger output. Shorter endurance.
He replayed exchange eleven from the Yukihiro spar.
It hadn't been lack of chakra.
It had been base drift. Shoulders rising under pressure. Weight shifting half a fraction too early.
If the output strengthened without reinforcing the structure, the body would bend before the strike landed.
Not more chakra.
Not faster thought.
Stability.
Daichi dismissed the drill after several rounds and ushered them back inside. The chatter resumed as they moved, quieter this time, fatigue settling into small muscles not used to sustained stance work.
As they lined up before entering, Roen lifted his hand once more.
Same volume.
Smaller space.
He compressed the chakra again, letting it settle into his palm without flare.
The weight returned.
The burn followed.
He held it one breath longer than before.
Then released.
Small gain.
No announcement.
Just adjustment.
He stepped forward with the others as the door slid open.
The model wasn't finished.
But it was no longer theoretical.