Swing out and make a half turn. Swing back to the platform. Sweep back slightly earlier than for a swing so that you rise into your set at the front end early. Then sweep your legs back straight, let go and make a straight front somersault. You could also make a half turn and catch the wrists rather than the stick. Just as for cutaways, Flyaway Halfs and Flyaway Rudys are also possible.
You can find out more about this trick in my books:
Thanks to Jean Francois and Max for providing a video for this page.