I think the question is how far do you go on the offensive. I know a lot of people say he should have just starting beating on the 4 girls, but I think he handling himself fine.
It's a tough call...but I agree. He was able to (best of his ability) keep the distance between himself/his girl and the aggressors. If he attacked the girls things could have went south as far as hitting women, etc is concerned.
I don't know if I could have shown the same restraint. If four hooligan bitches started hitting my girlfriend for no apparent reason I probably would have to knock those bitches out.