"I know that can't be easy," Cassie says. "I've kinda been there, once. The whole world just came down to me and three other people."

She pauses, nearing the bottom of her hot chocolate already.

"He did mention he traveled back to before you'd had him. And, uh..."

Her eyes widen slightly as the details he'd described of that meeting come flooding back to her. As do a couple of scenes from Back to the Future.

"...uh, yeah, I bet that was...interesting."