I posted similar before I saw your post. I think Astador actually has achieved what he wanted all along. He was trying to create this demon in perfect human form. By expelling Vald's consciousness (his soul?) from his body, Astador now has what he wants.
Of course, Havi and Vald aren't going to go down without a fight, but the demon who had bonded with Havi now believes what Astador has told him, that Havi's goal was to expel him from Vald's body, so the demon will be fighting against Havi.
I'm looking forward to seeing how it plays out.
Yeah, but demon!Vald has his(its?) own conscience. This is probably playing out like the fall out of Halvir's death: a few heartfelt words from Halvir and he is back on their side. Not that I'm not looking foward to it, I need my daily intake of cuteness. ;)
What I'm curious about is what are they going to do with human!Vald. I mean, it's highly unlikely that demon!Vald will agree to go back to sharing the body. And doing it while he is unconscious or something will not go well on the long run. Maybe there can be 2 Valds? But then they would need to find a second body and I don't think that's how it works. I really don't know how the author is gonna solve this.
Yeah, I think the demon will have to be sacrificed or sacrifice himself. At least he would be free from having been trapped in the sword all those years.
D: Noooooo! I like him! Human!Vald is too tsundere!
Ok, let's not talk about how frustrating this is. Let's talk about the plot! :D
So Astador wanted Vald's power, but neither human!Vald nor demon!Vald wanted to help him. At all. (LOL) So he decided to put him(them?) in a coma.
...
What?! Why? So that he can take away his powers? Couldn't he do it with Vald in there? O.o I don't get it. My best guess is that this happened so that Vald would finally be split into 2 bodies (can we have a threesome? Please? *¬*).
I imagine that Astador must be infinitly frustraded. I mean, he went though all that trouble with the original king, only for it to blow up in his face. And in comes Halvir, who not only got the guy (and the demon), but managed to create a simbiotic existence out of their obsession with him. He got everything that Astador ever wanted, without even trying. Demon!Vald would burn down the whole fucking world for him! Not that Astador doesn't deserve it, but sucks to be you, dude.
P.S.: The original king was fucking everybody, holy shit