Makes sense, since Ruler Jeanne's represents her sainthood and martyrdom, while Avenger's is pure hatred for the ones who burned her.
The party rapidly flees said cave, with her scrambling after them.
The reason why Kama is in Chaldea is twofold.
In the game, Kippoushi is the one who gives you a return gift during the Valentine event and is featured in one of the Craft Essences in Chaldea Boys Collection 2020, which almost always features only male Servants, including the gender ambiguous ones.
On top of this, the Moon Cancer has class advantage over them and walks all over them.