I'll wait for more info. However, if it's the way mtnbkr heard it, I think the shooter is going to get some punishment. As much as people don't want to hear it, if you wear a gun, in many ways you have to do things some would call "cowardly". Walking down the sidewalk and see some hoodlums ahead blocking your way? Cross the street or take a detour. Someone calls you out for a fight? Turn and walk away, at least until there's nowhere to walk.
In the case here, you get out of your car, remain calm, exchange insurance info, and drive on. Or call the cops if the other party starts to get verbally belligerent. If they approach you after you've done everything possible to avoid a fight, that's a different story. Especially two against one. But if you're being the mouthy one, well, sorry, you can't have a big mouth while you carry a big gun.