Bo on the other hand did need breath -- though she didn't need that hand clasped to her neck anymore, as the energy she'd just sucked out of him did its work and healed the the puncture in seconds.

"Well, it would put a whole new spin on Holy Communion, I guess." Small amounts of logic were seeping in, at least. Another second and... "You stopped me! Nobody's ever stopped me before."

From feeding on somebody else, yes, and it had saved a few people's lives, but not like this.