Swing out and turn around. Get up to sitting on the bar and then stand up so you are facing the platform as you swing. At the frontend, jump off the bar with a half twist to catch.
This trick is difficult to practice in the lines because they easily catch on the bar as you get up to standing on the bar. Also, as you turn, it's easy to get tangled in the rope that crosses the top of the rig. Therefore, you may find that it is only possible without lines (and therefore dangerous to attempt for the first time)!
You can find out more about this trick in my books:
Thanks to Juliet and Guy for providing a video for this page.