Creating a stick in the rear leg

Recently, I notice when I rotate the rear kua in a certain way to bring the knee up, a stick seems to be created between the rear kua and the rear ankle. Note that the leg itself is actually not straight, it really is just like the half horse stance with the rear side longer than the front side. It feels like this stick can support me with the proper alignment against an incoming force.

Two images come to my mind:
  1. Master Chen has his back against the wall and lets others push onto his chest, he can easily wave off the push sideways with his hands.
  2. A tissue is normally nice and soft. In order to for it to have some structure, we can twist it into a little stick. The tighter the twist the stronger the stick.
With this, I see myself making an effort in rotating the kua rather than fighting against the incoming force directly.