"Vampire," Spike snarled, the Master's indifference incensing him even more. The demon roared within him, and he started forwards, clean forgetting the probability of migraines, his demon demanding that he make this fellow show him some fucking respect. He lunged in with a growl, running on instinct, and he'd sunk his teeth into the pale neck above the suit collar before he'd noticed the absense of a headache.
Surprise made him reel backwards, wiping the splash of blood from his mouth, staring at the Master in complete and utter shock. "Bloody hell!"