After a few more minutes, it was discovered that Jon now had Sarah's body (as well as her personality - but only for another six and half days), Sarah now had the doctor's body (and Jon's personality), the doctor now had the nurse's body, and the nurse now had Jon's body.
It was all attributed to a malfunction in the personality swapping machine. And since it was a malfunction, the doctor had no idea of how to fix it. Until he did (or was that a she now?), Jon would be stuck in Sarah's body for the rest of his life.
But Jon didn't care. He wanted Sarah's life. And now he had it.
