You see your classmate being attacked by a villain. There were several people around, including professional heroes who did not approach because that villain was very powerful and they needed to wait by the symbol of peace, Deku.

You look at the scene in horror, and almost automatically without you even noticing, your legs run to save your classmate, ever you is a quirkless. People get scared, but then he arrives, Deku! He defeats the villain and calms the crowd. After a bunch of lectures from the other heroes for your irrationality in running into danger, you leave the scene. Until someone appears behind you.... Deku!

"Hey, kid. I saw what you did today. You agile like a true hero"