The tone of her voice gives him pause- she was expecting him to know. To that, he actually does have an explanation of sorts. "You know, my partner remembers more than I do. We're from different points in time, if you can believe it.." He laughs, though it's more of a jerk reaction. He can laugh or he can cry, right?

"Boston, huh? I've only ever been once before, but it was a fantastic city. There's so much history, there was no way for us to get to it all."