Sounds like attempted murder. It’s no excuse just because you’re in a ring. Continuing to pound somebody that is clearly unconscious can only have one outcome. That others had to come and stop him makes it clear, he would have continued.
Made worse by the fact that he was a spectator in the audience before he jumped into the ring.
New Jack/Mass Transit. New Jack was tried for aggravated assault. So trying this idiot is not a stretch.