User blog comment:Gabrielaaloo/SEASON 14/@comment-1031724-20181013040556

So, it sounds like Archangel Blades, when used on archangels, don't kill the vessels, unlike most other weapons. (Obviously a means of keeping Mark Pellegrino in the show following Lucifer's death)

And I'm guessing Crowley revived Nick before he altered Rowena's spell so Lucifer could possess him again. As king of hell Crowley does have the power, as it was he who revived Samuel