Sam cleared his throat in the break in conversation. He didn't really want to elaborate right now, to be honest he just wanted to forget the whole thing for a while.
So when she asked about a guide he was more than happy to oblige, after all it was a pretty pleasant way to spend his time and it would hopefully keep his mind off Dean or the mark of Cain.
"Uh well, the nun covered most of it but I'm happy to reiterate where needed, it's not easy to take it all in first time around." He gave another reassuring smile. "The important points are basically, magic portal brings people from different times and realities, no ones found a way back, but I'm working on it. So, we should probably find your apartment so you've got somewhere to stay until I do."