Yeah, okay.MA-Caver: I understand your reluctance to grab a knife blade. This is only sensible. But to reject it out of hand as disabling in all cases goes against the weight of the evidence.
First, you assume an incorrect method of performing the disarm. You dont grab the blade and pull. As you note, pulling on the blade more likely than not will cause your hand to slide along the edge. You will then be cut, no doubt about it. I have students who, in their enthusiasm, try this method all the time. When that happens, I usually trot out a live blade, put it in their hands, and ask them if they want to continue with that nonsense.
No, the way to do it is clear from the old manuals: either put pressure on the flat, or if you cannot do that, press against the edge and rotate the point toward the forearm. Either way, the weapon will pop out of the bad guys hand and you stand a better than 50 pct chance (more like 70, I think) of not being cut. If you had read my previous post, you would understand that we have subjected this technique to empirical analysis and experiment.
Second, your post disregards the established medical evidence. While you can be grievously wounded by a deep cut on the hand, you can fight on. The medical and historical literature documents many such instances. For instance, in Spada 2, p. 10, Swinney and Crawford recount a knife attack in which the victim managed a blade grab defense despite suffering serious debilitating injury which one of the authors observed first hand:
A 27 year old female was attacked by her husband with a type of serrated butcher knife. She was knocked to the floor where her husband sat on her abdomen and repeatedly attempted to stab her in the neck and chest. Despite her incredibly vulnerable position, the patient fended off multiple stab wounds, repeatedly grabbing the butcher knife by the blade. Her larger attacker repeatedly jerked the blade from her grasp inflicting multiple severe hand wounds.
Because knife defense is surrounded by so many urban legends which people pass on as gospel technique, it is imperative that any claim or teaching be soundly grounded in the facts.
Ultimately, the patient managed to wrench the extremely sharp serrated butcher knife from her assailant by the blade. She shen made her escape and called for help.
During the attack, the patient sustained seventeen separate wounds to the fronts and backs of her hands and lost the grasping function in three of her fingers due to tendon lacerations. In performing a through examination of her hands, I noted that the patient was also unable to flex her superficially injured right small finger.
When asked, the patient sheepishly explained that the LAST time her husband had tried to stab her with a butcher knife (several months before), she had taken the knife away from by the blade much sooner.
As illustrated, even severe tendon lacerations may not keep an injured bare hand from being used to disarm an opponent employing the blade grabbing technique.