Sam's eyebrows shot up at the doctor's words, not quite sure how to take them. He was reminded of his conversation with Martha over the journals. He hadn't actually met her face to face, but he had believed her and he found himself believing the Doctor now, mostly because there was nothing joking about the Doctor's demeanor when he said it. "If I thought there was a simple answer, I'd ask how that was possible," Sam said after a moment. "But it's probably way over my head. Do you know Martha, the doctor?"
Sam nodded. "Me and Shannon usually sleep in shifts. Just to be safe. But thanks, that does make me feel a little better."