Other Names: Half Twisting Reverse Frontend Whip
Swing out from the platform and turn around. Swing back to the platform and then back out to the frontend again. As you approach the peak, bring your legs up in front and pass them between your hands as if getting into a Whip position. Immediately open out from the Whip position with a half twist to make the catch.
You can find out more about this trick in my books:
Thanks to Däle Thomsen and The Flying Chutes for providing this video.