Topic of conversation elsewhere has me interested in opinions here.
In a discussion of an incident involving an attacker with a rather large bladed weapon, a couple of gentlemen were rather adamant the the correct course of action is to target the attacker's pelvis with the intention of immobilizing them. From a biomechanical perspective, it makes sense -- break the hip and they're unable to continue charging you. As an added bonus, you stand a decent chance of severing the femoral artery which will cause a fair amount of blood loss.
That said, I'm not sure that I agree this is a particularly realistic expectation. Under the stress of being charged by a maniac with a knife, I'm not sure that I would even think to shoot at anything other than the biggest target available. Even if I did, at the range and timescales involved, I'm not sure I see the sense in deviating from putting as many rounds as I can onto the highest probability target that I have available; the load-bearing area of the pelvis has a diameter of around half that of COM.
The argument seems to center around "but what if the shots to center mass don't stop them in their tracks?" Personally, given the opportunity to transition to a lower probability target and working under the assumption that I possess the burly nerves of steel to reliably make such a shot while someone is trying to render me into chop suey,* I'd be highly inclined to start shooting for the CNS. In reality, I'm going to lean toward poking as many holes as I can in the torso and praying to god that the bad guy goes down before he takes me with him.
Interested in everyone else's thoughts on this.
*Note: This assumption is likely false.