Look at this move at 5:00
<iframe src="http://player.vimeo.com/video/16836990?portrait=0" width="400" height="225" frameborder="0"></iframe><p>IMS official Film - Boulderfestival + Slackline WM from Berni Kogler on Vimeo.</p>
I've thought about such a move for ages but have only ever been able to make a "redyno" with one hand, not a move where you need both hands.