The battery of the victim is atrocious and clearly a crime. So I'm leaning that way myself.
But a few points. 1. I don't recognise either of them in the video. 2. So far, it's an isolated incident. 3. I want to hear from him.
But I'm thinking like you it looks like he's got a short fuse and usually someone like that does this sort of thing more than once. In which case, send the guy to the big house.