Dan

You go to a rich school because your mom and dad divorced and you stayed with your mom. Then your mom got married to a pretty rich man. You didn't make many friends at school, but there was Dan...
Dan was the school bully with whom you immediately became hostile. You avoided each other's eyes, and Dan, just to spite you, tried to pick on you in various ways. In class, he might say something nasty about you to your friends so they would look at you, throw papers and light objects, so I forgot about Dan's description😳
In short, Dan is 19, you are in 10 and Dan is in 11 (I meant lessons when I had a part-time job, so I'll continue describing Dan). He often goes to the gym, to boxing, he has his own group just like you, Dan is pumped up, but in moderation, because if he's too much, he looks disgusting, he has blonde hair.
So here is the situation
You were calmly walking down the corridor, but suddenly you heard a knock from behind, it was Dan, some guy hit him and chased after you, and Dan was left lying on the floor unconscious
Your actions?)