At a very high level, one can basically lock you up whether you want or not, and then bounce you out.
At a low level, the lock up part needs to be cooperated by the opponent, but that's a stage for learning this.
That is just to fix a variable and focus on a particular part of the training.
Whether you get bounced or sent to the ground is a matter of choice by the issuer if he is really good.
With the mat, we can train to get to the ground direction in a safer environment.
Every action should be a separation of yin and yang. In one perspective, having a non-moving point with some associated action to it.
There has to be a relationship between the action and fixed point, but the action cannot affect the fixed point and cause that point to move.
Having a staff going through a fixed ring is also separation of yin and yang.
Some of the moves actually work like that. I guess that is the same as bullet coming out of a gun barrel.
Bouncing people is like that. The head and feet of the opponent do not want to move, and you apply force to the middle section of the opponent, the opponent looks like he is being pulled back. If the opponent has good structure, he will be bounced. If he does not have a good structure, he falls
If you can't hold him, he steps backwards, nothing happens.
I always have the image of a trampoline for bouncing. Put the trampoline vertically. If the punch in the middle can not overcome the stretching ability of the fabric, you can bounced back. If the punch can overcome that, the sides of the trampoline is pulled in the direction of the punch.
To issue up, you can also achieve it by having a fixed point, and you press down on a lever. So in theory, one part presses down, one part sends it through the ring or tube.