Circle, spiral, twist, turn, come in, escort out, snare, trap, lock. A round of push hands can provide us training in these various movements of the arm.
When you can movement seemingly free, yet adhering to a fuzzy pattern of movements you can begin to use it to find and create an opening for your attack.
In the second part of the clip I go through a few patterns of movements using them to probe until I found the opening.
Though we are playing movement patterns we should be careful not to become fixated with only one set of movements. Let the movements flow freely, yet find the pattern in the movements.
Then you can change at will in response to a stimulus. So if in the midst of movement my student tried coming too close and pressuring my arm against my body, I kept my awareness and moved from inside to outside while neutralizing his attack and returning a counter.