The buzzer was a flat electronic tone, the same sound as every other UA exercise buzzer, designed by someone who had decided that functional and loud were the relevant qualities and aesthetics were not.
He was already moving before the echo finished.
The street in front of him was a three-block urban simulation — the same construction principle as the Battle Trial arenas but larger, with actual building interiors accessible, the kind of layout that gave both parties room to operate and made escape a meaningful challenge rather than a formality. He knew the gate was at the far end. He did not know the exact route to it because the exact route depended on where Aizawa was, and Aizawa was somewhere ahead of him and had been inside the arena for twelve minutes before the buzzer.
The Shock Absorption fragment was present in his chest at its usual frequency — the second-heartbeat quality of something passive and ready.
Then it wasn't.
The dampening arrived before he could locate the source — a cold absence spreading from the fragment's position outward, the specific quality of a thing that had been operating and was now not operating, and simultaneously the OFA in his limbs went from the reliable hum of a maintained four percent to something sluggish and reluctant, a mechanism that was present but working against resistance. Two percent, at most. The difference between a capacity and a fraction of it.
He looked up.
Rooftop. Three buildings ahead. The silhouette was the silhouette of someone who had been watching him since the buzzer and had let him take three steps before making the confirmation of identity that the Erasure required.
He dove left behind the nearest building's corner.
The fragment returned for two seconds — a flutter, the passive rhythm resuming — and then the sightline was recaptured through the gap between buildings and it died again. The blink had been under a second. Aizawa's timing was precise in the way that twenty-plus years of quirk management produced precision: not automatic, not mechanical, but deeply informed, the way a musician's breath control informed their sustain.
He knows where I went, Yami confirmed. The building cover buys me the two seconds of his blink interval. He'll move to a new position within thirty seconds.
He moved.
The maintenance corridor access was on the building's south face — a utility door that he'd mapped from the background geometry of UA's campus infrastructure, three anime episodes of establishing shots that had included enough detail to identify the corridor network under the urban simulation arenas. He'd spent forty minutes cross-referencing before the exam and had identified two routes to the far gate that used the corridor system to break Aizawa's sightlines at regular intervals.
The door opened. He went through.
Inside: the quality of a space that existed for infrastructure rather than people, narrow enough that the OFA limitation was less relevant and the capture scarf was less effective, the overhead pipes and junction boxes that created visual interruptions every four meters. His footsteps in here were too loud and he couldn't do anything about it.
He turned at the first junction — left, toward the route he'd calculated as the faster of the two.
The fragment flickered online, offline, online. Aizawa was tracking his movement pattern through the building above, using the sightline windows — the gaps where the corridor ran beneath gratings or maintenance windows to the surface. Each window: fragment off for two seconds, then back.
He's following the corridor layout from above, Yami calculated. He knows the network too — he's done this arena before.
He was twelve seconds ahead. Then ten. The second junction: he went right instead of his planned route.
Right was wrong in terms of gate efficiency — it added forty-five seconds to his travel time. Right was correct in terms of the prediction problem: Aizawa had anticipated the left turn. He'd seen it in the way the overhead footsteps above him had shifted, preparing for the next sightline window at the position where the left route would have put Yami.
Aizawa was not following him. Aizawa was intersecting.
Pattern reading has a forty-five-second window, his memory supplied. The Battle Trial. Bakugo adapting. The same note he'd written in the library in a different context, about a different person, and filed under real people are faster than approximations.
The right-hand corridor ran for twenty meters and then hit a junction that gave three options. He took the center and felt the fragment die immediately — a maintenance grate above, Aizawa's eye already at the angle, the man moving across the building roof with the specific ground-coverage efficiency of someone who had done this with students before and knew the network as well as he did.
Better, probably.
His pulse at the sternum: 152 BPM.
The fragment was not going to help him if he couldn't keep his heart rate out of the range where the Bloodcurdle shard's malfunction threshold lived, which was irrelevant because both fragments were disabled anyway, but the data point was present and accurate.
He wants me to think about the scarf, he'd written three days ago. That's the surface layer. What's underneath it?
The answer he'd reached at page four of his notes: Aizawa's combat philosophy was containment, not defeat. The scarf didn't need to hit — it needed to define the space where Yami couldn't go, and the definition of that space created the corridor that ended in capture. He didn't chase. He shaped.
Yami had spent three days mapping the shaping pattern. He'd gotten forty-five seconds of successful application before Aizawa had adapted.
The third corridor junction had a sound he hadn't planned for.
Not footsteps above him — the sound was at the same level, coming from the corridor to his left. The specific quality of controlled movement in a tight space, someone whose footfall economy was so good that the sound was more felt than heard, a pressure in the floor rather than a noise.
Aizawa had come down.
The sightline windows above had been driving him right and right and right, and right had been a shape — a shaped corridor that led to a junction where the left route was occupied.
He went right again.
The maintenance corridor ended at a utility door. He hit it with his shoulder — it didn't open, the latch was stiff from disuse — he hit it a second time with the OFA at two percent behind the impact and the door opened onto sunlight.
The scarf came past his ear close enough to disturb the air, the yellow fabric at the angle of a throw that had been leading his trajectory by a half-second, and the half-second was the margin.
He cleared the doorway.
Open courtyard. Two blocks to the gate, both of them exposed.
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