Because Bungie wanted to reference their own games. You know as well as I do that they are different universes, Bungie has no rights to Halo so they can't use it.
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This is actually correct if you checked out the Cayde Stash Easter egg.
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That doesn't prove they are the same universe. Also they don't have the rights so it's irrelevant.
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I am not getting into an argument about this, ok?
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