[Sebastian's right hand is busy holding the torch, but luckily grabbing someone by the collar only requires one hand. Sorry, now he's getting blood from his neck wound on Spike's clothes.]
I have no interest in how servitude works for your sort. Would you offer your service to someone stronger for protection, or would such a person make you swear loyalty to them? [A light, nonchalant shrug. He doesn't particularly buy that that's how things work in this thing's world, but...]
My master will do neither. Consequently, that should be the end of your interest in him, should it not?