You might be interested in this thread:
http://www.handgunforum.net/showthre...ht=stop+threat
and this one:
http://www.handgunforum.net/showthre...=shoot+abdomen
This discussion takes place elsewhere on the forum. The points are;
You aim for center of mass.
Your purpose is to stop the threat, not kill.
Leg shots, head shots, gut shots assume you have a target that is standing still, waiting for you to take aim. If that's the scenario, you are not under attack.
Trying to hit a live, moving target when you are being attacked is a lot different from shooting from shooting at the range.
Never fire a warning shot, it is too dangerous for you and for bystanders.
You can shout a warning, but don't fire.
If your not being attacked, you don't shoot.
WM