The ball doesn’t start to get tossed backwards until after Walton’s knee was down. The ball is in his hand when the knee is down.
...
I disagree. The indisputable video evidence required by the rules isn’t there to overturn the on field call.
The League, and practically every non-UM fan, disagree. The call was so obvious the ACC suspended the officials responsible for two games.
Look at it another way:
If you were wondering if that guy fumbled the ball, would you say it was not in his hand when his knee was down from that pic?