U.A just entered the war, but before they could do anything... AFO suddenly teleported Aoyama beside him... It all made sense now, Aoyama was the traitor. Everyone looked pissed at Aoyama as he was holding back tears

Deku: Aoyama, what are y-

Right before Deku could finish, AFO cut him off

AFO: Oh you didn't know? Aoyama Is the U.A traitor. And is that the top student with you? They have... Rewind and teleportation, right? They might as well join me since you're weak, Deku.