I've noticed sometimes when I purposely shoot an enemy in the leg in bursts I kill them. Other times, I down them.
I thought the main reason to shoot an enemy in the leg is to slow them down and to down them so an execution can be performed. I've noticed this is not the case and appears to be random.
Does the game randomly decide whether or not to down an enemy no matter where you shoot? Apart from when the enemy is shot in the head.