The way I learned it was that it came from handstand stunts. If a flyer is in a handstand and can pop to her feet the traditional snap down way, why couldn't she then do it in reverse? Or to the side?
Because of that any time you're inverted you can exit the inversion going any direction you would want to go hypothetically. And USASF only defines an inversion as any time the flyers head is beneath her hips, so even though I'm sure they meant for it to be more "handstand" like, it opens up a lot of gray area for getting as close to lateral as possible while still being "inverted"
My thing is that a rewind, especially a group rewind, when done correctly, technically enters the same position. If the flyer lays back like she's supposed to and my bases drive her hips and legs, then by the time I flick her to finish the flip and go for the ankles she is definitely inverted with her hips above her head briefly while I am still in connection.
I've argued for a while that, done controlled enough, a big name team could definitely get away with rewinds. Does anyone know if the rules stipulate that it has to stop in the inverted position or anything like that? (TBH I am biased though as I have been saying for a while now that rewinds to below prep level should be allowed at level 5 if we follow the current skills progression provided by our rules where you can rewind with two arms at level 3 and one arm at level 4. But that's beside the point)
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