Lie #10 Grappling with a knife
I was in Germany with a group of martial artists teaching "street knife work." While demonstrating an empty-handed with one of them, he tackled me and took me to the ground (This is no big deal as when I do demo's I don't allow "courtesy attacks." I insist people attack me like they would were it a real fight -- this occasionally means that I get slugged or taken down. This was one of those times). Anyway, when we hit the floor I realized that there was no way I could contest this guys strength, he was a bull, full of muscle and grappling skill. The thing was I had landed next to a practice knife that I calmly picked up and dragged it across his throat.
We stood up and his eyes were the size of saucers because he realized what the significance of what had just happened. A knife had come out of nowhere and had this been real, he would have been dead. The amazing thing was is there were only a few other people there who did too. On of the bigger proponents of grappling stood there and said, "He tackled you." To which I replied, "Yes, and I slit his throat" "But, he tackled you."
In their minds there was no difference in the levels of damage. The fact that I had been taken down counted the same as a knife across the throat. Personally, I'll take getting slammed to the ground any day over getting my throat slit.
The myth of grappling is that it works everywhere. The fact that it proved so successful in the UFC ring has blinded many people to the fact that there are critical differences between fighting barehanded and fighting with weapons. While empty-hand fighting might easily turn into an endurance marathon, where size, strength, physical shape and ability to endure punishment significantly influence the outcome of an altercation, that is not applicable to weapons work. In that arena, every man bleeds the same.
Oh yeah, remember how I said bio-mechanical cutting did have validity to it about the damage a knife can cause? What makes you think you can keep on fighting with that kind of damage being done to you? All a guy has to do is cut you a few times to seriously reduce your ability to move and then wait while you bleed out. Now the really bad news, being pumped up on adrenalin is going to make that happen faster, the higher your heart rate, the faster you bleed out and lose strength. All he has to do is out wait for your strength to fail before finishing the job.
Do not attempt to "grapple" with a knifer. Once on the ground, you are not guaranteed to be able to control his knife arm well enough to prevent him from carving you up. If it were a barehanded fight, then you can often prevent him from being able to generate enough power to effectively strike you, but a knife doesn't need power, it just needs to touch you. And if you are attempting to control his arm while on the ground, he will wiggle free and repeatedly cut you until you can no longer continue to resist.
Now for the fun news, I know of a small knife being manufactured that is called the "clinch pick." A small concealable -- and easily accessible -- knife, that can be rammed into a grappler's guts and chest three or four times before the grappler knows it is there. Where it is carried makes it nearly impossible for the grappler to prevent its deployment. When you realize he has it, it is too late.