SXSW Bully sucker punch. Justified or cheap?

He played no game. I guess it'd be ok if I went up to anyone fighting and sucker punched when I had no business interfering with it right? I don't put myself in bs and I've had my share of fighting. I'm sure most you would be in the crowd watching this type of behavior. I have no qualms with fighting. I could careless if one kills the other. It's none of my business what takes place. But I know cheap shots when I see them.
you don't put yourself in bs, but you've had your share of fighting? yeah, ok. i'm a smart ***. every fight I've been in is because I put myself into the bs.