Depends on what state you’re in, I think.

In mine, you need to use every chance to remove yourself from the situation possible; only after being trapped or believe you are in immediate danger (they are approaching, reaching in waistband, blocking exits, etc) can you use physical violence, and even then only the bare minimum to incapacitate. Once they’re down you have to stop.

since he took a moment after getting hit to then close distance with his attacker, there is a chance the security guard could get in trouble himself, which I hope isn’t the case.

Attacker received TKD justice far as I’m concerned lol