This? Was why she and Felicia needed that welcoming committee. Trying to explain this place to someone new was always a challenge. Still, Felicia had chosen her for the project for a reason. She could handle this. And judging by the way he was dressed (Amy did have good taste!), Rose was almost positive Rory was from after the time when he started traveling with the Doctor. So he should be able to handle strange at least a little better than some.
"I think I can help you with at least some of that," she offered, giving him a genuine smile. How long had she wanted to meet him only for Amy to now be gone? Still, River was there, and the Doctor he knew. Maybe that would help. "I'm Rose. Rose Tyler. And I've a friend called the Doctor."
That should do it. Rory knew the Doctor. It wasn't like trying to explain him to the alternate universe Donna. "You're in America, actually. Earth, 2012." She could explain the whole Biblical seal issue in time. Baby steps. She'd also wait to see how he reacted before she mentioned Amy.