[stonewall50]

If someone attempts to rob a place and they are unaware of your presence, but they have a firearm on the cashier/server/whoever? If you wait on the person to turn or take the firearm off of the person you are in a sitution where they may NOT take the gun off of them or they may shoot the person. If you announce your presence you may run the risk of a hostage situation. If you just shoot them you risk either collateral from either the bad guy shooting on his way down, or YOU hitting the bad guy and the bullet passing through(unlikely but possible if you have the right ammo).

If the person has a knife I would probably make it known that a gun was on them and give them the option of dropping the knife, but a gun changes the equation. I am wondering what should be done in this situation? I don't know if I would trust my anatomy lessons for the apricot shot. Anyone else want to weigh in on this?