Aizawa was making bets with the teachers

Aizawa: Who wants to get blocked by Endeavor first?

Present Mic: I bet I can.

Vlad King: But you can’t use your quirk.

Present Mic: Ok!

Midnight: Ooh! That’ll be a challenge!

Nezu: That would be hard theoretically!

All-might: Make sure to be annoying.

Present mic: Noted.