This is like one of those gacha life 24hour challenges so 1A and Aizawa were doing their own thing and they all got teleported into a room with no windows or doors no way of escape

Bakugo: WHERE THE HELL WE!!??

Denki: it looks like a room

Bakugo: YEAH NO SHIT SHERLOCK!

Deku: how do we get out?

Then suddenly you who was a teen villain appeared in the room as well and everyone got into battle positions