Trick starts like a layout somersault. After leaving the bar, perform a double somersault with a full twist before opening to the catcher. Full twist can be performed: In first somersault ('Full in') In second somersault ('Full out') Half in each ('Half in half out') This trick can be performed straight, tucked or piked.
You can find out more about this trick in my books:
Thanks to Randy for providing a video for this page.