Well. While we all thought our beloved Halo character, the Arbiter, was not, in fact, as Earthly as we all thought. Maybe he was an alien! People are getting stupider, maybe in the year 2556, no one could discern between humans and aliens. They could easily have mistaken the Arbiter for a human, or mutated goat. Think about it.
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Arbiter? An alien? What a silly thought!