[For a measure of "survive" and for a measure of "human", at least...]
As I said, it was meant as a killing blow.
[Why are they even lingering on these details? Sebastian walks the few steps up to Lucifer and extends a blood-soaked hand, meaning to turn Lucifer's head to the side - so he can take a look at the wound himself, then, if Lucifer insists on being slow about it.]