Jon chased Zoe as best he could down the stairs, but it was hard with the boots he was wearing. It felt like he had weights on his feet. And the corset he was in was making it hard to breathe. How did Zoe put up with this?
By the time he made it into the kitchen (which was where, Jon saw, Zoe was headed), something must have happened, because he saw both his body and someone else ... and the look on his body was clear confusion. Was Zoe not in his body anymore? If that was true, then she must have swapped bodies with the other person in the room, which was ...
