Proper spot and down?

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Originally Posted by Robert Goodman

If I saw a player actually fall on a ball that was on the ground, unless the player wound up with some strange part of the body like his back or his legs on top of it, I'd consider that moment of trapping of the ball between body and ground possession.

That's not consistent with the definition and interpretation of "possession".

The ball must be held or controlled.

I've seen players trap a fumble only to knock it loose from themselves with nobody else around them.