This technique was never taught by Imrich Lichtenfeld and Eli Avikzar because the knife can slide pass the elbow when you try to catch the opponent’s arm in your armpit and the blade can reach your body.
If the student in the attacker role is not submitting to the defense and is retracting his arm in the same position for an additional stomach thrust resisting any forces implied upon, then there is no way this type of arm bar can be applied.
The problem is during demonstration that students are being submissive out of fear to get hurt by their instructors, or training partner, and if they got hit good and lost their ability to recoup and attack again, then any follow up pose will work. But if they did not then this technique is suicidal.
For instinctive defense you put your forearm 90 degrees toward the opponent’s wrist so the stabbing hand will not slide forward and stab you elsewhere and you simultaneously deliver a strike to the opponent’s face to break his train of thought and prevent him to retract and stab again in a slightly different angle.
If you see him coming with an under grip from a distance you hook your palm with all fingers on his wrist as you do a taesabaki to his dead side.
If you were already standing closer to his live side, then you do an instinctive defense with the front hand, switch your hands to grip on his wrist and continue with your front hand with a knife hand strike to his carotid artery.
It is recommended to finish the first move with a grip on his fist to bend him down and kick his groin and then peel the knife out, and then if you are standing in closer to his live side with a knee to the groin, and then peel the knife.
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