Karyn panicked at first as she erased Jon, then she saw something that releived her. Jon still had the stone.
"Jon can I use the wishing stone" Karyn said.
"yes" Jon replied in a dull monotone.
Karyn picked up the stone when the thought hit her. If she had the stone she could wish back Jon at ANY time. So she didn't have to wish him back now (though she was still considering that as an option), but could give jJon personality traits of others to make a perfect Jon. Or maybe give Jon her own personality so they could be closer. Or give Jon an amusing personality to see what happens.