They never consider the 3rd armed guy in a theater. He now sees two guys shooting so he starts blasting both of them. No time to aim or worry about collateral damage.
Now, the 4th armed guy decides to take action. Looks like there are three serial killers firing at everyone. So he just blasts away.
So, the security guard who heard the shots rushes in - gun drawn. Who does he fire at first?
Etc., etc.
ahhh, schmit, not the ole 4 shooters thing again! hate when those scenarios happen! well, the security guard of course, starts wildly shooting into the air, just like in bonannza. he then does his best jackie chan, picks off shooter #1, rolls, pulls out 2 ruger 9's with laser sights and takes out #2 and #3 simultaneously. meanwhile #4 sees all this, soils himself and surrenders. he then walks out of the theater with a babe in each arm
and this is why i never leave home without my double barrel, mega-magazine magnum, grenade launchers, awe hell, with bump stocks and silencers