I was just wondering if the dead thrall spell could be cast by npcs. I wanted to create a boss fight with 3 Draugers that have the dead thrall spell and a few dead draugers around the area. I had 2 questions about the spell:

(1.) Can an npc cast dead thrall on dead bodies?
(2.) If an npc comes back to life with the dead thrall spell and the actor that casted the spell dies does the thrall die as well?

Thanks in advance for any of the help that is given.