"Well, he's dead now, and all his intricate Dark Wards magically tattooed into Albus’ flesh only bought the old man some time. Besides, I'm pretty certain that he was ordered by Albus to do whatever it took to secure his position with the Death Eaters, including euthanizing him." Narcissa would have pitied his death, but she knew better. At least Severus would be less unhappy now.