Simple, aim for center of mass and don't stop firing until the thug is on the ground.
Why do you think the robber made him take off his pants?Sounds to me like the thug has done some time. Either State or Federal hard to tell but I would bet he has done some time.
By having to have been involved in a few incidents I have noticed a lot of times Inmates when using the bathroom will remove one leg from their pants. Thus having only one leg in the pants the other free. When I inquired about this I was asked if I had ever tried to defend myself with my pants around my ankles. Getting at restricting movement of your legs. I may have misread the story though if he had them take the pants all the way off then I probably did.Sounds to me like the thug has done some time. Either State or Federal hard to tell but I would bet he has done some time.