same ngl, goddess dave is my og.

go read "staying with ajumma" or "unlocking her"

realistically, the word traitor is by definition a person who is an ally but then becomes an enemy.

In this scenario if a priest snuck in, they would be a spy not traitor. However, if an ally snuck them in, they would be a traitor for concealing a hostile force.

Something else that must be recognized is that like <TruePurpleMK> said, although his mother is a priest, she stopped attacking necromancers. In this case, this mysterious priest was doing suspicious things in the middle of a forbidden area, in the darkness of the night, in an enemy faction. They knew that they were doing wrong and thus attacked them without even a word
Mom = ally priest
Unknown = enemy priest

Well considering the hostility and seemingly being up to something.

Wears black and has black stuff. Suspicious!

Plus why would any priest be on a necromancer collage campus doing prayers and strange rituals in the woods if not up to no good?

Or maybe I just agree with you and I find it a bit odd where this assumption of 'traitor' is coming from and even why MC would choose the word "traitor" with MC's background.

Maybe

imagine some rando called dave is a god