Midoriya, in his green jumpsuit as the hero Deku, is out on a routine patrol for just this sort of thing. He walks the streets in his armored shoes, but sometimes he takes to rooftops for a bird's eye view. He's always careful not to dislodge any roof tiles; avoiding property damage was one of the first things he learned in the Hero Course at UA High.

He turns his head towards the unusual lightning, the flash reflected in his large green eyes. Danger Sense usually feels like a pricking sensation in his head. Here, it's a stabbing pain and impetus for reflex as something comes hurtling towards him. He activates his super strength in a flurry of harmless wind and sparks and leaps to the next roof.

There's a directionless ferocity in attacking anything that moves, but Midoriya doesn't think this humanoid is a Beast. Corruption can alter someone's mental state, but it tends to leave the physical body mostly intact. These are the only thoughts that flow under the surface of dodge and prevent. What exactly he's here to protect against, he's not too sure.

"Oi! Stop!" he calls roughly. "Who are you?" He's used to having enemies, but he doesn't know this one. "Can you hear me?"