I will mix into Do You really Want To Hurt Me and watch the guests head for the hills. No but seriously I have worked in this case and continuing the music will in most cases keep things from escalating while bouncers or the wanna be autorities take care of the issue usually getting it outside. I have worked with many security teams over my years and I often ask whats procedure if they have eyes in the back of their heads and hopefully being in such a position have intuition to smell issues out and handle them before it escalates. I learned that technique in my younger bar days as I worked my off nights from DJing as a bouncer. You dont have to be the biggest baddest to squelch any trouble. I recall one of the best bouncers of any I worked with was a female bar owner I worked for.