Taste of Death wrote:In Han Shi Yi Quan, when we say "closing the door" it refers to left/right rotation of the body, the rotation at the end of the strike. Don't forget to close the door.
Boxing does too. Transitioning from offense to defense is referred to as opening and closing the door as well. The shoulder roll defense is an example of closing the door which Haney is training with Mayweather Sr. in the video. Countering with the right hand is referred to as opening the door.
Using some IMA terms loosely, "close the door" by shoulder rolling (yield/roll back) opponent's right cross by closing/folding the right kua (inguinal crease) and rotating which shifts the weight to the rear hip taking the head offline and leading opponent into emptiness. Open the door by opening rear hip, rotating, closing front hip, shifting weight to front hip then issue right hand or uppercut.
James in the OP may be making a different point using a falling step punch similar to a xingyi punch.