Wrapping the forearm in the posture ” Repulse the Monkey” from Yang Family Taijiquan.
The action of coiling and wrapping the embracing palm against the opponents forearm helps to remove slack and defect the opponents posture. The concept of spiraling through the three zones of the forearm is something I have only experienced training with BP Chan.
The anatomical measurement of the forearm is three fist widths long. This is referred to as “the three fists” when talking about moving from center to center with control. When hands are crossed in the first fist following the wrist, the opponent can easily sweep my hand away. I use this knowledge to spiral up from the first fist into the second fist or middle fist. This is the center that controls both ends of the forearm. I turn my center axis to overturn my palm , wrapping it into the middle fist of my opponents forearm. The Centrifugal action of the wrapping , combined with the positioning of the middle fist acts to defect my opponent’s posture by taking up much more slack then if I simply seized their wrist. Instead I let him hold my wrist and I start to move from slow to gradually accelerating. Moving in this way causes my opponent to tighten his grip as I gradually start to pull away. This acts to tie him to my center So that I may turn him at Will by turning my own center access . It is important that I move from slow to fast or I will pull my hand out of his grip. When I do the movement from slow to fast he grabs tighter and becomes essentially a fish on the hook .
The wrapping of the embracing palm also leaves me on the inside gate so that I may protect myself from any possible changes.