[Nothing so far as Michael is aware. There are still gaps in his knowledge of what was happening topside during the decade he spent in Hell. Certainly the Darkness didn't destroy all of creation as he and his brothers had once been lead to believe she would if she were left to exist freely. Knowing his Father's true nature now, he does wonder what she's truly like. If she ever shows up, maybe he'll find out.

Michael looks a shade amused at Geralt's reaction. Most people would've taken it as a compliment.]

You say that like it's an insult. [Being called human, that is.] Humanity was once my Father's favourite creation. Their existence was the reason Lucifer first rebelled and was cast out. It's been an important talking point where we're from.

[He's matter-of-fact in his delivery. Geralt is from another world entirely, so he can understand that it's not as important to him and that he's not interested in debating it. The man remains more human that not in his mind.

He shakes his head at the suggestion that whatever a Witcher is might've mutated a demon. The kind of demon Dean would've become was very much of their world. Michael knows how those work.]

Demons aren't a physical mutation. They're a corruption of the soul.