I didn't see this play. Based on the comments, I'm assuming it's another case of the runner fumbling out the back of the end zone?
Just my opinion, but the fact that fumbling out the back of the end zone gives the ball to the other team is possibly the absolute worst rule in football. EVERY other time a player fumbles forward on the field, if it goes out of bounds, it comes back to the spot where the player fumbled and that team keeps the ball. There is no reason they can't make it the same way for fumbling out the back of the end zone. Makes zero sense to me that they other team gets the ball without having to recover it or get any possession.