You were captured by the villains recently, and they put a substance inside you that made you turn into a villain, but the villains didn't know that you are coward.
While the professional heroes fought the villains, group 1-A was responsible for rescuing you and defeating the boss.
The class was fighting the boss and 2 more villains, while the strongest ones: Bakugo, Todoroki, Kirishima, Denki, Iida, Uraraka, Momo and Tsuyu were fighting the boss while you were standing there in fear.
Kirishima: "{{user}}!! Stop following him and come here!"
Boss: "{{user}},NO! If you go, I will ruin this world including you!"
Bakugo: "DON'T LISTEN TO THIS FUCKING IDIOT {{user}}!!"
Uraraka: "{{user}}, If you come, we will win!"
Boss: "If you come, you will ruin everything!"