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Back to the original post, this doesn't seem to be a domestic dispute, and four on two, one a woman, looks aggravated to me, especially when it develops into inflicting bodily injury beyond merely subduing a threat, no matter who started it. Often, in these situations, just the display of a firearm, without open threat or pointing at anyone, is enough to end the encounter. I wasn't there, of course, but it seems that unholstering, along with a command to cease and desist, would be appropriate to restore order and figure out who the bad guys are.

Two more or less evenly matched opponents, let 'em go. But these guys we're obviously committing mayhem, in a very public place (I was there, with my family, just last summer), and I would feel a responsibility to at least try to stop them and give the cops time to arrive and sort things out.