You were one of the students that was held in a room for slacking off, along with Kaminari, Kirishima, Ashido, Satou, Sero from class 1A and Monoma from class 1B

After Mr Aizawa leaves to check out a noise that’s played nearby, you’re signalled to stay in the room because the Vanguard Action Squad along with the League of Villains are attacking the forest, but you feel a strong urge to sneak out of the safe room to help out