Alder did not expect that they would have to directly deal with one of the avatars in the western continent. He thought that they would only directly deal with the Distorted God Apophis, but they were suddenly getting easily dealt with by one of the corrupted avatars. Some of them know of these corrupted avatars as one of them did defeat the Avatar of Horus.
Even the spirits that are under his control are telling him that the Avatar that is in front of them is a monster disguised as a human. The elemental spirits could feel the deep bloodlust that is not easily detected by mortals. The Avatar of Menhit is one of such individual as she was covered in a blanket of blood that smells incredibly thick.