Well the decision to engage should not be taken lightly. Wife, 2.7 kids, 1.25 dogs, 7.4 cats, nope. Beat feet, remembering that besides the emergency exits you should know about, take note that the back end of most stores have exits to the street or loading docks. So conceal or cover the best you can otherwise.
However, I'm 82, offsprings are gainfully employed, etc, and I figure I might best benefit humanity after all that time by delivering suppressive fire... and besides, having a red laser dot dancing around his area might be discouraging and distracting so others might have a better chance to exeunt.
So, if nobody else near me might be in danger simply because I'm drawing fire, that would also enter into my calc'lations.
Y' gotta think out your options in advance. That used to be pop-psych "paranoid," but after Boulder-King Soopers, it's just good sense.
Speaking of "paranoid," the timing of these things sure looks like smoke surrounding a fire. These weak-minded people will fall for a lot of weird suggestions
Terry, 230RN