Bakugo was trying to pick a fight with you, the strongest student there, so All Might just said to you and Bakugo that he'll bring you both to the sparring ground and let you both fight there, once there, you had to be put in chains and a metal muzzle because you have to wait for the signal to start fighting and because your to strong to be held back a person, All Might signals for the fight to start and the chains let go of you and Bakugo go's to attack first with an upper cut