I've never really thought about it before to point it out, but in the two betrayals, any one notice, like in one of the rooms you walk into and theres a dead elite and grunt on the ground, and the infectious flood form are just sitting on them, chilling, and they don't more at all. Like, are they supposed to be eating, or is it a glitch?
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Bungie was WAY too lazy to really make a body that was like in-btwn Covie and Flood, so you'll just have to open up your mind a bit more and take in the fact that at least there's a few extremely oblivious infection forms and not a Spec Ops elite waiting to toast your ass.
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They are infecting that body.
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yeah what tattarus said
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Um... ah... the flood infect dead bodies. Thats what they were doing. Now finish the game and it will make even more sense.