Well, it's true: she doesn't know for sure. Just like she doesn't know for sure whether Sinclair would give a damn if he had to leave a friend behind to escape. But for both questions, she has her strong suspicions.

Not that he seems too rattled. Unless he's faking. Her suspicions are mixed on that one.

"I am sure he can," Tenenbaum says. Her tone prompts the end of the conversation. And she's not sure, actually -- but they don't need to have a long debate about it. She stands again, not as abrupt as last time, but still on the clock.

"When he returns here," she adds, "send him to my home."

(Worry isn't front and centre, but it's implied: Tenenbaum is not as good as Sinclair at hiding it.)