There were seven adults in that mess. SEVEN. You want to assume which "sides" they're all on? Also, you don't have any way to know if any, or how many, of them may be carrying a weapon (like a knife or gun).

A normal LE response, presuming an adequately staffed shift and available units, to a reported disturbance/fight like that is usually a minimum of 2 cops, preferably 3, to respond to that sort of mess. That's still going to be inherently dangerous for them, too.

You want to jump in solo?

If you're asking about using deadly force, how about looking at it this way ...

Do you really expect cops responding to that sort of bar fight to use their guns to stop that sort of fight?

If someone is going to want to assume the responsibility to be lawfully armed in public, unless they want to discover the critical shortfalls of their knowledge and decision-making abilities the hard way, it might be prudent to find some sort of training and/or legal advice to help them prepare to make the sort of informed decision. One which hopefully helps keep them out of jail, out of civil court, out of the hospital, etc.

Then, there's always the risk of being the "man with a gun" at the scene of disturbance call, especially if a caller talking to Dispatch says some's pulled a gun. Then, you may not be able to be identified as the "good guy" by the arriving cops before all they see is GUN.

Also, if you're not usually involved in such chaotic and dynamic situations, you might not realize that as your pulse sky rockets, and the hormonal fear response kicks in, you may experience one or more of the types of sensory deficit problems.

Things like an attention deficit (tunnel vision) and auditory exclusion (don't "hear" sounds outside a narrow focus), which means you don't see/realize the cops have arrived and are yelling at you to drop the gun. May not even hear their gun shot(s), either.

Off-duty cops can get seriously hurt or killed jumping right into the thick of things on their own time, when they're "out-numbered" and don't know the circumstances, the other participants (or whether there's another couple of them hanging back), or whether anyone's armed.

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Ret LE Firearms inst & armorer