https://ags.myfootballnow.com/watch/1447#251893

This one went in my favor, but I think it's incorrect. The call was a touchback. Apparently, my recovering player's impetus carried him into the end zone, without touching the ground? He recovered at the 2-yard line, then traveled diagonally backwards almost four yards to wind up a yard deep. Maybe he was trampling the other players between those points?

The rule I found that most directly applies:
(5-1-2)
If a defensive player, in the field of play, intercepts a pass or catches or recovers a fumble, backward pass, scrimmage kick, free kick, or fair catch kick, and his original momentum carries him into his end zone where the ball is declared dead in his team’s possession. The ball belongs to the defensive team at the spot where the player’s foot or other body part touched the ground to establish possession. If that spot is in the end zone, the result of the play is a touchback, even if the ball is not on, above, or beyond the goal line. (11-6-1)

It's a very rare situation, so I don't expect it to have a high priority.