"Stopping" is cause by catastrophic damage. That's it. Simple. Ask an experienced deer hunter what brings a deer down the quickest... a shot that "dumps all its energy and stops" or one that passes all the way thru and takes the heart out with it? They will always say; The one that passes all the way thru. It doesn't matter if it's a bullet, or an arrow. It is the "cutting and tearing" the actual "damaging" that works. If it was mere "penetration" archers would be able to use simple target arrows and be successful, but they don't, they use big nasty razor blades tied to the end of a very fast moving relatively heavy stick.
Find out what all the fuzz is about... seriously... get AGrip!
Brooks W. Speier
AGripô Installation Video
Never let anyone who is clueless about defense tell you what you can and can't do to protect yourself and others.