Well, that's what she was afraid of. She chewed on her finger, looking around. How to put this?
"Yeah, Severus, that is a little important," she sighed heavily. "See I know this is going to be difficult to believe, but it's not just that you're in New York City. You're also in the year 1964,"
She held her hands up, as if to say "Whoops", and let out a small laugh. How do you convince someone of something like that?