[ Up until now he's assumed that she is exactly what she looks like: innocent and easy, but the smooth adjustment to the sudden movement does not go by unnoticed and he can only come to one conclusion.
Swaggering out through the isle Spike locks his eyes on her, voice dropped to an almost sultry, predatorial purr. ]
Slayer. [ He can't know. She could very well be. They die so quickly and she looks the age. ]