Later that night, Karyn walked into Joanne's bedroom and saw her sister holding something that glowed.
"What's that?" she asked Joanne.
From Joanne's point-of-view, Karyn had just found out about the stone that day. But this was a different reality, so all of Karyn's memories of that reality were gone.
Joanne really didn't want to explain everything all over again. But she may not have a choice.
She turned to Karyn (now her twin sister) and said ...