Very early on in training we solved the "people shooting the gun/gun hand mystery". Unless trained otherwise when people pick up a pistol they usually do so with one hand and "point" it. This requires lining up the eyes, gun and perceived threat. As something moves away from you it becomes smaller so your line of sight drops. This puts the pistol in COM of the shooter, either dead on or to the side (more likely when they are moving away). During the fight we focus on the threat, not a part of the threat. We shoot at them. Before our rounds hit the torso they need to get by the hand(s) and iarms(s) in front of it. I would say that in FOF about 80% of the first rounds fired during the altercation strike the hands/arms if the attacker is armed with a pistol. If he has an impact or edged weapon the rounds strike the torso. Mystery solved.- George