When we run the numbers of the knife attack.
There are two ways to make knife-fight contact,
Contact 1) Body first , then the knife
Contact 2) Knife first, then the body
Body first - the so-called "prison shanking" has been around since cavemen. You grab the body in some way and then start stabbing. Hit and retract. People invent cool names to sound cool, or to be unforgettable. But its a pumping stab. Hit and retract.
This grab-first, with a caught arm or neck or bear hug, especially if its an ambush or a surprise? REALLY bad. Neck wrapped, or bear hug, or arm catch/and or wrap. This contact can be from the north, south, east, west of on the flat combat clock, all the numbers.
In seminars I can only set up the captures, offer some general advice and then I let the guys fight it out. I will tell you this. The defender usually grabs the weapon bearing limb with one hand while in this mess. Its a very, very natural response. Then hits with the other. These are to experience and work on, not come to out with one simple solution. There is no one simple solution. Its like a football. You make some plays and maybe they'll work. If you train like a champ, you'll perform like a champion, but!...On any given Sunday...
If you don't grab and try to stop the pumping knife? MAN, you are like...freaken' dead. If you become hypnotized by the advice from some versions of the "don't grab" crowd? You are tricked and blinded into never grabbing. Its very bad doctrine - a short-sighted fools doctrine, actually.
Hock