When you make a move, your opponent can respond in 2 different ways:
- against you,
- yield into you.
When your opponent fight against you, you can borrow his resistance force, and take him down in the opposite direction.
Here is another example:
I've used that backwards, circular step a lot, just with a narrower stance so my feet don't tangle. I've had great success with it. I've also used it in the scenario you show in post #6 as well.