And indeed, violent rebuke does seem to be what he was afraid of. Though Rey hasn't threatened Carlisle with bodily harm -- here -- he is well aware of what she can do when provoked, and his own nervous, paranoid personality dictates he avoid that at all costs. He sometimes fails, as when he loses control over his abilities or cannot catch harsh words before they escape him, but he has spent a good chunk of his life assuming blame in all situations, even those where he isn't at fault. It all lends to his often apologetic nature.

"Thank you," he utters. There's a pause, and then: "If you, ah. If you don't mind, could I have the bottle back?"