That means a running back who crosses the goal line can theorically fumble after scoring. I saw two steps then the knee hit then the ball came out.
Joint us in reality - it was a pass and the man did not have possession. No catch. The Ref did not hand the game to the Bucs for the second time.
No because the runningback already has possession. Like I said the key is "with possession" a receiver that is falling during the reception is not "with possession" until he finishes falling, his feet are immaterial (unless one comes down out of bounds), what matters is possession, he didn't have it. An RB that already has possession ends play when the ball touches the line so there can't be a fumble because play is over, play isn't over on a pass until it's a reception or not.