Help with Entropy

I have seen many yoyo players perform the trick entropy and/or variations of it. I haven’t seen a tutorial anywhere so please help me. A tutorial video link or description of the trick would be helpful.

This is the only thing I can find. It’s a video called Entropy, but it’s a bunch of tricks.

Do you have a video of someone doing the trick?
If so, then someone might be able to make a tutorial.

I saw it on the “How to be a Yoyo Ninja” DVD by Duncan, but I can’t find the video on Youtube. Entropy is that trick where the string is wrapped on your arm and you bounce the yoyo off the string back and forth (now that I think about it, it’s kind of like a boomerang on your arm).