Of course, the other option is just say “please no don’t do it I have a wife and 47 kids!”
You could also try running, yes, or hiding, but “carrying a gun” and “trying to get to an exit or shelter in place and only using said gun if he blocks the exit or finds your hiding spot” are not exactly mutually exclusive, you can do both, you don’t have to “run towards the sound of gunfire” like some marine. In fact that would be the much smarter way to do it, “camping” isn’t frowned upon in real life, this isn’t COD. As for identifying who the shooter is “it’s usually the guy shooting unarmed people,” but failing that, “better to be sure and confirm your target,” unfortunately this puts you at a disadvantage but he’s willing to shoot random people and you aren’t (I hope), so what’re ya gonna do.