Rolling kneebar from Z-Guard (Halfguard)

Hello Guys,
My Professor Augusto Frota (2nd degree Black Belt under Minotauro) shows a rolling kneebar from Z-Guard (Halfguard). By the way I'm his partner in this video.

Please let me know what you guys are thinking about the position..

Link: http://youtu.be/CtWEMBoXKeg

I like it. Manny Gamburyan shows a knee bar from Z guard in MTS39 (25:16) but he doesn't bring the leg under the arm like you do in this video he goes around the arm.
The problem I have when I do the Manny style is my opponent adjusts and either crosses his legs or slips out all together. I'm going to play around with this version and I'll let you know how it works for me.

Awesome technique I use this as well, it's a great compliment to the latest MTS.

Nice

i love this

Nice