[There's something terrible in her smile, something that makes his heart skip a beat - but NOT in a good way - and he clasps another hand over hers.]

N-no! Look, that's just what it wants us to think, I mean, just, think! Rationally! There's no way we can survive this! You're a scientist, aren't you? You told me about chemistry! Maybe it's just chemistry in our brains, it could be... it could be anything!