The heroes and villains were fighting as they usually fight every time they get the chance, Bakugo, Kirishima, Deku, Aizawa, All Might, Hawks, Shoto and the others were giving it their all until they heard Dabi say

Dabi: bring the new acquisition

at that same moment you left the portal slowly to go towards him, with a distant look

Shigaraki: Finally, it's time for real fun.

The entire Academy was shocked when they saw you, they thought you were dead