Of course, Duanmu Huai hadn't forgotten the bald old archbishop. He hastily broke the railing to pull the old man out. From him, Duanmu Huai learned of their dire situation - the Vampire Count had taken them hostage to resurrect the necromancer Nagash during a ceremony.
The elf princess's blood was vital to Nagash's divination, which is why Manfred fed her well, but placed her under a curse that made her weak and unable to escape.
Hmm... no wonder the Elf Princess was lifeless when Duanmu Huai examined her earlier. Even if she wasn't dead, she might as well have been.
The bald old archbishop had a much worse fate. Manfred planned to use him as a vessel for the resurrected Nagash, and so tortured him in every possible way to make him mentally collapse, turning him into a living dead. Then Nagash could possess his body and be resurrected.