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 depends what you mean by working together. I believe the Fallen and Cabal are friendly with each other, so yes, I'd like the AI to work together if they happen to by allies. But that's not to say it should be the case for all AI's. Infighting is a cool game mechanic, and I'd like to see that in Destiny as well.