Some great info here guys thanks!!
My thoughts on the original question - Proof that this works?
IMHO only the person using the technique against an attack can PROOVE that that technique works, at that time, against that attacker.
In a violent confrontation we have very few constants, its pretty much all variables. In your individual FIGHT your only constant is likely to be your EDC weapon(s).
Other than that the only factor over which you have some level of control is your preparation (training, awareness).
So once the fight is on whatever "technique" we use is likely to be dependant on the dynamics of the fight, bearing in mind if we are using a knife we still have another hand, elbows, feet, knees, head and teeth, a 'combined arms' approach is always better .
Back to the specific technique of Bio-Mechanical cutting, the human body is basically a computer operated mechanical-hydraulic system, so disrupting the system we have to damage/destroy one or more of those components - Bio-Mechanical cutting is of course an important part of that but as Randy excellently points out it cannot be the only part.
And the technique itself has to be applied with sufficient violence to achieve its aim, as has already been mentioned it isnt easy to cut tendons and muscles especially through clothing in a dynamic situation, sure a whip cut to the inside of the wrist may be effective against some bare chested banger in LA, but what about Alaska in winter?
No technique in isolation is going to work every time, even a 12ga slug to the chest, or a .44 mag to the head!
So rather than expect proof that a technique works I would rather ask how do I train to increase my ability to perform that technique under pressure? and how do I combine that technique with others (armed and unarmed) to best prevail when it comes to my FIGHT.
...If you can force your heart and nerve and sinew
To serve your turn long after they are gone,
And so hold on when there is nothing in you
Except the Will which says to them: "Hold on!"...
If - Rudyard Kipling
ECRG, June 2006
Warrior Skills Camp, July 2009