What Jon didn't know was that the stone had chosen him to be the start of a "swap chain". He would swap in some manner with the next person he touched. Then the person he swapped with would swap with the next person they touched, and so on. But once Jon had swapped with someone else, he couldn't swap again. And once all the other "touchers" swapped with someone else, they couldn't swap again either.
As it turned out, the type of swaps that would be happening would be ...
