I have a hard time visualizing this. Seems like you'd be a few feet away from thier neck at best.Well, if it's the one were you are landing in a low stance with cossed feet and a double low block were you are crossing your wrists, it's originally for jumping on top of someone you have just thrown to the ground, and the hands are doing a (fairly standard) choking technique by pulling on both collars to seal of the arteries on both sides of the neck.