Wrong way scoop & score

[SC Ump]

Originally Posted by RadioBlue

What if B55 had entered his own endzone and then peeled back into the field of play and, while at his 2 yard line thinking he had scored a touchdown, flipped the ball to the R? Now we have a fumble at the 2 after a change of possession and the rest of the play happens as described. (B recovers in their own endzone while during the loose ball A is flagged for a PF facemask.)

Upon my initial reading, this is what I was thinking. I completely missed the IFP aspect.

With that said, for your second version as posted here, it would be B's ball, 1st and 10 from their 15. 10-5-2 (in the 2009 book) notes that the enforcement spot for any found committed by the defense is the goal line when the run ends in the end zone and would have otherwise resulted in a safety.