Buffy would want to hear as much about that as Spike'd likely want to hear about work-roughened pirate fingers getting all friendly in her feathers.

"Lose'em and you die. Lose one and you nearly die. Lose some feathers? And it's like a flu from hell. At least, that's what it's like for me. But it means a blade's useful to have on hand if you need to clip an enemy on short notice."