Trick ID: 311
Half turn to Straddle Whip position, half turn to catch
Swing out and make a half turn at the frontend. At the platform, lift your legs up in front of you, pass them around the outside of the bar and hold them in a Straddle Whip position (although facing the opposite way from usual). When you reach the frontend again, push your legs forwards towards the bar (to unfold your body) making a half twist at the same time.
You can find out more about this trick in following books: