Zhao Changhe could pretend to be the Snow Eagle when tricking novices, but when facing a real master, no disguise would help. His Blood Evil Skill shone like fireflies in the darkness, probably only able to pass as Xue Canghai.
Thus, when seeking the "Witch Demon King," he had already removed his disguise, not wanting this "Snow Eagle" identity of his to be exposed, saving it perhaps for future use...
The Witch Demon King wasn't called Nai Aozu or Arthas; he was named Yin Kui. Zhao Changhe had heard this name from his "subordinates" outside. That was why he realized the presence of the Yin Corpse before the Thief Saint and Sisi did—the name had sounded just right, and indeed, he found what he was looking for here.
