I imagine he was out-gunned ... lol. Anyway, he became one of the best negotiators our international union had. He walked into a negotiating session that had been deadlocked. When he removed his top coat, he was wearing nothing except a jock underneath. Well, he did have a sign around his neck that said, "Strike."
There are some folks that you just never know what they will do. Presidents Kennedy and Reagan (and to a degree, both Bushes) were that way. They made some pretty wild threats, but of course, they were always prepared to take the action they had threatened.
I guess any one of the bikers could have tried to fight back, but they might have gone down in the process. BTW, the 'gang' went over and policed the yard and helped replant the flowers and shrubs that had been destroyed. I think the Mom ended up providing them with cake or cookies. It is amazing what can happen when everyone does the 'right thing.'