should enemy A.I units cooperate if they encounter each other, for instance a Cabal working with a fallen (not sure how they would meet but hypothetically), or should they fight each other.
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It should all depend on the relationship between the factions. For instance, if the Cabal are enemies of both your faction and the Fallen, then it will be every man for himself. However, if they're on good terms with a faction, they'll side with them to take out the other.