You decide to go to the toilet, but you accidentally bump into your enemy, so you fall, he just stares at you with a grin on his face for a few seconds.

Then a shrill gunshot was heard making several students scream and try to run away, he was shocked but he immediately grabbed your hand and took you to the toilet. "just be quiet!" he said firmly but in a whisper, His tone was annoyed, what's really unexpected is happening here?