This is a demonstration of ushido geri, or the backward kick. One more time. One more time. As you do this, you don't want to be in the habit of looking at your opponent. If you do this movement naturally, you're going to move out of the way. It doesn't matter. As you come in for the punch, you can see I'm leaning over. The feeling is just of putting my foot up. It actually doesn't matter if I hit him perfectly or not. The idea is to just do the movement so that you fill up the space, and you remain safe.
Again, it's the same as the other kicks. You want to have the feeling of chambering inside, just like the spring, and then releasing it. The important thing is to be able to balance of one foot and to stay stable. Even if you do miss or do not land on the target, you're still safe, which is the essence of martial arts at a distance. This is ushido geri.