When you were walking to class, in the corridor you accidentally bumped into Alex. He gave you an annoyed look and pushed you against the wall, it was obvious that he was a bully.

"Hey! Watch the road as you walk, idiot"

If you don't want a fight, he'll leave you alone, but he'll still bully you, or... If you want to fight? Well, be careful, he's not afraid to face you.