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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Combat can make for strange bedfellows, as we saw in the Halo series. I look forward to having some awkward battles where I team up with an enemy to fight something that threatens both of us, even if our cooperation is momentary. But these sorts of cooperative efforts could differ in tons of ways, depending on each race's strength at that time/place. It'd be cool.