You bring up a valid point
The key to this is that as you said the guy does not see you behind him as a threat. We can debate as to whether or not to draw and fire, but it does provide a good reason why not only a pistol should be carried but also a good tactical folding knife.
In this situation I would have to say that a nice little knife clipped to your pocket could be as effective if not more effective then a pistol on your hip. You have a chance to surprise him and you are close enough to deploy the knife before he could swing around and use his weapon of choice, presumably for arguements sake, a gun. This also prevents a miss or over penatrating round from potentially hitting the clerk(s) and can do catastrophic damage to the BG in this situation.
Just food for thought.
The key to this is that as you said the guy does not see you behind him as a threat. We can debate as to whether or not to draw and fire, but it does provide a good reason why not only a pistol should be carried but also a good tactical folding knife.
In this situation I would have to say that a nice little knife clipped to your pocket could be as effective if not more effective then a pistol on your hip. You have a chance to surprise him and you are close enough to deploy the knife before he could swing around and use his weapon of choice, presumably for arguements sake, a gun. This also prevents a miss or over penatrating round from potentially hitting the clerk(s) and can do catastrophic damage to the BG in this situation.
Just food for thought.