This! The only way it might be possible is corked. If you need to validate this, build a jump, don't pack it down and try to back flip it. When the jump collapses under you, you will be inverted with no rotation. Even with no rotation it is impossible to create rotation to half front flip out of it, so there is no way to stop a flip and then go back the other way. Having said that, I would love to see the video of the attempts as long as the subject didn't die or sustain a spinal injury during the attempt. Here's a thought though. If anyone is into ski base jumping, that would be the way to test it out.