Uh uh , I so love it when one comes in a forum offers crap advice and when called on it starts backpedaling trying to save his crap advice .
chopkick Yes indeed lets examine what you said in your original post and let's even compare it to your second round of rambling .
The pelvic girdle is a very large target and if shattered will immediately collapse the subject ending the threat.
Notice you said THE THREAT not a knife threat or a club threat THE THREAT which implies all types of threats including gun threats and then you repeat this at the end of the post with your little football didy .
In football if you take out the runner's legs you immediately stop him and end the threat of him scoring. Folks, the same goes for ending a threat in the street.
Once again A THREAT not a knife threat meaning all threats shall be neutralized with your Pelvic girdle hit .
Now lets examine your knowledge of training , there is NO 21 foot rule . What there is is a drill that a experience Police officer "Sergeant Dennis Tueller" inspired to demonstrate the fact that conventional thinking as to at what distances a person is a deadly threat when armed with a weapon other than a firearm due to the reaction time needed for a uniformed office to draw his duty weapon is completely false . Prior to Tuellers experiment it was an often excepted "Fact" that a officer/person with a gun was in no danger from a person with a knife or even a club beyond contact distance of said weapon regardless of where the gun was on the officer .
The drill itself is flexible depending on factors such as the type of holster one uses as modern retention holsters are much slower to draw from one level of training etc because it is more of a reaction time demonstration than any type of Rule .
In all the articles I have read on the drill I have never seen a professional suggest a pelvic girdle shot be attempted and justly so .
You see while you state the ineffectiveness of a COM hit you are once again thinking this pelvic girdle is something out a of a magic show . In the drill most shots are fired when an assailant is right on top of the intended victim , the laws of physics aren't going to change with your Pelvic girdle hit .
A charging assailants momentum is going to carry him to the point of contact distance and even if your shots have achieved 100% paralysis below the waist nothing is going to prevent him from slashing or stabbing you with a knife and if he grabs hold of you and takes you down with him you will be stabbed and or slashed repeatedly . At least with a couple of well placed COM hits his attack may end due to blood loss with the girdle hit's you suggest your life now depends on your skills at hand to hand combat laying on the ground with perhaps your attacker on top of you because the attacker will most certainly be trying to take your gun away and still stabbing and slashing with his knife .
Would you now suggest an ineffective COM shot or two or will you still try for your magic Pelvic girdle again ?
Of course all of this supposes it was indeed a knife as stated in your original post you didn't specify you simply said THE THREAT .
Your dismissal of the effectiveness of COM shots is based purely on the performance of certain hollow point ammunition and their lack of penetration , there are several choices of defensive ammo , many penetrate considerably deeper than others putting the upper spinal column within easy reach of a frontal shot . I personally keep my 45's loaded with 200 grain semiwadcutter bullets , these will out penetrate almost all of the hollow points being touted for self defense .
As to your "Get the hell out of Dodge" goes you have just used deadly force regardless of where you intended to hit your attacker and you better stay put and summon the police , running from the scene will only make you appear guilty of a crime instead of a justifyable self defense shooting .
I suggest you go to "The Police Policy Studies Council" website and do a little reading on the Tueller drill and try and find any mention of a pelvic girdle shot to end a threat .
Go here and click on Staff Views then find Tueller at the bottom .