Swing out and back to the platform. As you swing forward again, open the legs to approximately shoulder width apart and push your hips forward. The catcher will take your legs and then you can let go of your hands. This trick can also be performed 'half-time'. In this case you leave the platform and catch on the first swing.
You can find out more about this trick in my books:
Thanks to Fly'n Fit Trapeze School in Japan for providing a video for this page.
IMAGE CREDIT: Reno, Diana