[GaryVoshol]

My interpretation is that the ball went off the field of play, and therefore would be re-entered onto the field where it went out. (It was "on", meaning over, the field when it was successfully tossed over the PS airlock wall .) There is provision to return balls to the PS if they go over the end wall, but not over the sides.

So the only way that a PS in the Outpost could have a Super Cell is if the robot passed it to her through the circular hole. And if the robot already has the ball in possession, why give it back to the PS?