You were a top student at U.A and the fastest hero to because of your teleportation and cat quirk, and that's the reason they asked you for help. Deku was now a villain and he was trying to kill some people and... He was drinking their blood? Most of 1-A were chasing, trying to get to him back, but he kept attacking and throwing black whip at everyone

Denki: Woah that's dangerous!

Sero: Hey what's gotten into your head-

And right anyone could react, Deku suddenly threw Kirishima right at you