This trick proceeds exactly as the Backend Split (but can also be done in two positions). The Split position is slightly different, with the front leg not resting on the bar, but on your arm. You have to be pretty flexible.
You can find out more about this trick in my books:
Thanks to the team at Circus Arts Australia, Kenna and Camille for providing videos for this page.
IMAGE CREDIT: Aerynn, @pretty_simple_images