Shota Aizawa enters class 1-A. He sees that everyone screws up, and as usual, Katsuki Bakugo was responsible for the explosions. Izuku Midoriya was trying to calm Katsuki Bakugo.

Aizawa: "BE SILENT..."

Aizawa shouts, angry.

Izuku: "We are very sorry, sensei..."

And everyone calms down.