Can pummeling a bully land a person in legal trouble?

”Ian” has a wheelchair bound disabled cousin that goes to his high school. Two bullies often taunt and tease him. Ian who is 6’2” and 203ib see these bullies picking on his cousin, tipping his chair back as if to dump him out of it, grabbing his backpack and not returning it, etc. Having had enough Ian runs over and clocks the 1st bully who goes down like the Hindenburg. The second bully tries a counter attack but the wheel chair bound cousin distracts him just enough for Ian to bust him one in the chops, he staggers but doesn’t fall and runs off. When the 1st bully staggers to his feet in a daze trying to shake the cobwebs from his head Ian gives him about 5 to 7 more punches in combinations of overhands, jabs and upper cuts; the kid goes down again seemingly out cold but he is on the ground twitching. The paramedics are called the kid rushed to the ER where it is discovered he had a fractured eye socket, blown ear drum and a severe concussion. The boys parents want Ian arrested and brought up on charges. Is there any criminal case to be made here IYO? Didn’t the bully precipitate the pummeling he got because he was picking on another kid, disabled on top of that? Or because he never really got the chance to throw a punch at Ian he is Ian’s victim? If you were on a civil jury would you award the bully damages against Ian?