OK, first Gerry....
And then Drop...
C'mon you guys... no Marquis of Queensbury rules here?
Marquess of Queensberry Rules - Wikipedia
One on One, Mano e Mano, "That Dude challenged my Honor," or "That guy just grabbed my wife's ***," and now Let's take this outside?
Keep in mind, one guy attacks one other guy, and the attacked reacts in self-defense and as long as he's not over the top, he's got that defense. One guy attacks another guy, and that guy and his friends jump on him and make him a puddle, that's felony assault. On the Group.
Working security is a gray area. Don't mark people up and it's usually OK, as the cops aren't forced to "see" anything.
Note: I did not mean to sit there and eat popcorn while your boy is getting brained with a bottle, that in itself is uncouth.