Dexterity Cross-Body Delay
Symposium Butterfly is butterfly where you don't plant your stalling foot while performing the out-to-in dexterity.
Demonstration of a Symposium Butterfly.
A solid Butterfly makes landing a Symposium Butterfly dramatically easier.
Try to hop on one foot without the footbag to gain strength.
Rotate your hips and shoulders toward clipper position before the stall.