"What, the old dustbags?" he asked, attempting to put a little arrogance into his tone. "Nah, I've faced worse than them. What are you, a survivor of the Great Vampires? Nah... E-Space..." he mused, his silly rambling letting him relax for a moment. Only a moment, because as the vampire's tone darkened, the Doctor seemed to feel his body growing weaker. Feeling vulnerable and helpless was not something that the Doctor enjoyed much, but for the time being he was trapped.
"Never," he said, a tenacity of spirit shining through despite his physical entrapment. "I'd rather you killed me," he spat forcibly. He wasn't actually entirely sure of the process. With some species it would have to be voluntary; with the Great Vampires, it had been a long process during which the victim had the rather gruesome choice of giving into death. But this vampire? Well, he was hoping for the voluntary option.