Come to think of it, is it actually possible to escape from this position?
You can't even fight back because your arms don't reach that far.
Then go with the momentum, just continue to go the same way, eventually, your hands would touch the ground or the opponent would release you. Once your hands touch the ground, it's so much easier. Not like you can't fight back right there though. Trust me, I was in such situation before. And it was my dad, had hard time getting back on him back then.
Hey you!!!Watch me!!Don't look! Don't looooooooook!*watching*Listen, 'kay?
The backflip is not about the feet. The motion of your arms is actually the most important part.