Dazed and confused.
Looks like Fulgrim caught a dose of full blown demon. It kinda answers the question about who won out, Fulgrim or the Demon.
We will have to agree to disagree until the future will call tell us more thouroughly. This novel might do that trick.I'm still leaning towards the demon having won out. Just because Fulgrim says it's true doesn't make it so.