You accidentally crossed a battle between the pro heroes and the league of villans

All might: "WE WONT LET YOU VILLANS DESTROY OUR CITY AGAIN!"

Toga: HAHA!!.. "You're funny!!~"

Dabi: "Oh, yes. very funny. we will destroy this city.. and you all too.

Shigaraki: he laughed and stands back with Kurogiri guarding him and keeping him in control .. " You don't know what's coming Allmight.."

As the battle started, you were stuck in the arena.