AI: Heels: Two Halves Make a Whole (Wish)

A short while later, at the stranger's home, they were still thinking about the heels they wished up for Jon. It had struck them that they could add further complications for their victim. Clutching their copy of the stone in their hands, the stranger spoke, "I wish when I made my previous wish that turned Jon's wishing stone into a pair of heels, I also included the following condition that I'm about to describe: That anyone who makes a wish while wearing only *one* of Jon's magic shoes will have their wish only *half* granted." The stranger smiled. It would be morning soon.