Perhaps reconsider the actual ammo/bullet for higher lethality. However, the unknowns here include a potential for wearing a heavy coat that could affect expansion. Also, the shooter did achieve the goal which shoot to stop the aggression/threat.
That’s true — there are lots of unknowns. That being said, the perp being able to run away with two gunshot wounds to his torso and a third to his neck really makes me wonder just what he was shot with.