(Slightly OT) Possibilities with one point safety

[Fan10]

First off in FED, my scenario would not have happened since once the defense gained possession, the try would end.

My scenario comes from NCAA where the ball is still live once the defense possesses. My play involves the offense fumbling and the defense picking it up and taking it 90 yards the other way to the 5 yard line. They are then hit and fumbled, and the ball is recovered by the original offense. A player for the original offense is then hit and fumbles the ball backwards out his own end zone for a safety.

Highly unlikely I know, but it's the only scenario that I can think of where the team who just gave up the TD scores one point.