When the light was gone, Sarah looked down at herself in shock. She was in Athena's body! "Ugh, I'm a freak!" Sarah yelled out in disgust. It was weird for her to hear Athena's voice instead of her own.
Athena, who was in Sarah's body, stood up. She was also disgusted. "Why'd you bump into me, you freak?! If I get some sort of weird disease, I'm blaming you..."
Jon's precautionary wish made no difference at all. The new reality is that the new person in Sarah's body was always Sarah and acted like the old Sarah, and the new person in Athena's body was always Athena and acted just like the old Athena.
Jon would remember the new person looking and acting exactly as the old one did--which means Jon's memories wouldn't change at all! The wish should change nothing (if it wasn't for the fact that Sarah heard the wish and was exempt from the reality change).
