How come this person is still alive?

Question

In Season 10, Episode 3 Soul Survivor, when

Dean is cured, after having died and subsequently turned into a Knight of Hell

Shouldn't he die on the spot, since his body had previously been mortally wounded, to the point where he actually died?

Answer 1

Not necessarily

We've seen evidence that demons¹ are able to repair some level of damage to their meatsuits:

• When we see Abaddon in season 8's "Sacrifice", she doesn't have wounds around her wrists:

  

  This, despite the Brothers having left off her hands when we last saw her (though she notably left the sutures around her neck in - maybe she liked the look?)

• In the season 10 episode "Reichenbach", we see Dean cut his palm with the First Blade, and then heal it:

  

Although this is something we've never seen another demon do (most of them don't care a whit about their meat), it's not impossible that Dean, sentimentally attached to his own body, simply healed himself.

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¹ Or at least Knights of Hell, which is what Dean appears to become