Tenebrus, I'll make this quick, since the answer to your question is
quite simple.

Ashtani and Shallamese soldiers may decide to fight a common enemy in
some cases, especially since Evil is the antithesis of both Good and
Freedom.

-Neuroi Op'shae-Yuridja

Penned by my hand on the 17th of Ero, in the year 464 AF.