Don't think he didn't notice. Spike was far more observant and perceptive than most would give him credit for. He remembered their conversations before too. "Just means I'm not a vampire like you're used to, Diana." He pointed out, but didn't say more.

"Left it is then." Spike said, with an 'after you' gesture although he was walking side by side with Diana anyway. He wondered what other questions she would ask. Of course, it wouldn't matter as soon as they made that turn.

Spike didn't react quite as like he'd been 'struck', but the way he stiffened and then hurried forward after a concerned "Little Bit?" made it obvious something was wrong. After several quick steps he was crouching down. Even removing his coat and bundling it up to place it like a pillow. "No, come on. Stop joking." He pleaded, lifting up an imaginary arm as he put his ear to the wrist.