The second is that he used the power of magecraft to revive his blown head... In the words of advisers more well-versed in magecraft, it'd take a considerably powerful Magic Crest or an arcanum close to magic, but it's not impossible to bring someone nominally 'back from the dead'. Let's keep this one in mind for later.

Fate/Strange Fake: Volume 7, Chapter 21 ("Beings Shaped In Man's Image I")