Yeah, I stated in a previous update that going into chapter 5 locks you out of the vampire route even if you lose to Dorian specifically due to story related reasons. Beating him before then is also possible, though rather difficult.
Oh yeah, I forgot about that. But sticking to the same point; I think chapter 4 has a few points that conflict with the vampire route. I feel that once Mila has cleared the "dungeon" of the chapter, it becomes unbelievable and inconsistent to still enter the vampire route.
