The very apt in general summary apprecitation, would seem to be that situations one may come upon, or situations which may develop around one, or situaions one is alerted to for there being loud voices or screams or yelling or other noises, are not always well defined, or readily interpretable, as for who is 'who', and as for what is actually happening...upon which one would base an intervention or referee service.
Some situations, seeming impositions, apparent predations, persons engauged in fighting or struggle or poised with a weapon drawn or out...may indeed be unambiguous...others, may not be what they appear.
Personally, those few times when I have intervened in other's affairs, I did so at some fifteen feet distance, at-ready to draw, and, with the best humor or courtesy I could muster, if nothing else than to say, very smartly, "Time to STOP! And give this a rest for now..." Left Hand 'palm' out and up as if to emphacise the 'STOP!' aspect...right Hand ready to draw...and, a look of eye and face which says, "...good natured, but don't kid yourself about being able to take liberties!"
Seeing then what eventuates.
This can be very dangerous!
Beware!
Have your own escape route, cover, or strategy, or ready-TO-draw-and-shoot, in mind.
Things can happen fast