It seems all we are fighting is humanoids. The Cabal, Fallen, Vex, and even the Hive are humanoid. Heck even the Covenant except save the Engineers were pretty much Humanoid.
Where's all the multiple limb crawling or floating horrors that know how to use weapons at in this Scifi/Fantasy opus?
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But, then we wouldn't be able to ride their bikes when they weren't around.