And now it was Jack's turn to frown. Derek didn't talk when he didn't have to very often; he knew that if he blew this off (which was tempting) the topic might not come up again.

"So your sister was strong," he chanced. "I wish it meant that for me. As far as I know it's universal in my world."

Not that there were many lycanthropes at home to ask, really. Or any.