What is the name of the boingy boing variant?

Is there a name for the trick in which the player manipulates the strings of boingy boing with the nonthrow-hand thumb? I’ve seen it used by a variety of competitors and would really appreciate a tutorial.

Video example:

It looks like just a boingy boing with alternative fingering. I attempted it however but found that my hand was just getting in the way. Probably didn’t help that I was using a full sized throw either. I’ll continue to experiment with it though and see what works best for me.

It’s called protrusion. Great trick.


Thanks, I’ve also been wondering about that one.