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After a while, you pick up on things. Watching over a bunch of kids for so long gets you used to their habits, quirks, and the certain ways they did things. Jirou tapping out a rhythm on her desk occasionally, Iida’s hand movements during conversation, things like that. One that became especially easy to spot, however, was one of Midoriya’s.

When he got focused, he got focused-- his rapid mumblings were impossible to ignore. He’d heard it enough times to immediately pick it out in a crowd, which is ironically what was happening right now. However slight, his ears picked up the voice and both the jumbled and quick string of thoughts made words, which turns him around to head in the direction of it without a second thought. 

He finds him hunched over, clearly trying to figure out what’s going on in the way only Izuku can. Aizawa stands there for a few moments, watching him work, before he finally shifts in place to garner his attention.