"So... what's your story?"
"Oh, nothin' special."
It's got to be a lie. There has to be a story behind the way he backs down from eye contact, yet flares up at the slightest miscalculated move; there's got to be a story behind the loud shirts that make up for his nearly non-existent personality. He doesn't make sense. Sarah wishes that he made sense, because she doesn't understand, and she was never even that good at doing maths so why was she expecting to be good at solving people? Asking is always easier.
Except when the person you're asking is clearly lying.
She wonders where Tim grew up. Maybe it was close to where Brian did, seeing as they knew each other pretty well. She wonders where he got those jeans, and his smoking habit, and that look in his eyes that screams "back off".
He says he's never acted before, and that he's only here because Brian asked him for help. She thinks he's doing a good job at it, so far.
If she were to lean close to him, or slip her hand into his, would his chest do the same acrobatics hers does? Would he pull away, uninterested, maybe even angry at her? She wouldn't be surprised. She's not worked him out enough in her head, not enough to be able to paint a picture of the reactions he could let fly with. She still needs his story, but she can wait.
Sarah knows he's lying, even if Tim doesn't.