Here goes stupid question.
How did the Gravemind get to the Citadel after Arbiter killed the Prophet? The tentacles seem to come up from below and the sides of the Citadel but as we know, there's nothing but a huge chasm that probably drops to the other side of the Installation into space. So, somehow the Gravemind made its way from the crashed High Charity "over" the void that lies beneath the Citadel. We never see the rest of its body during this scene or when you're fighting your way out of the Citadel. Just its tentacles. Maybe someone can explain this?
Like I said.... Odd and dumb question. :P
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The Flood transmits through the air! D: Ever notice that one marine on Floodgate and he gets infected BEFORE the Flood fall on him? Or that marine in the building who gets infected despite saving him from the infection forms? But seriously, just like how the CE cutscene, where Cortana starts basking in all the Forerunner knowledge, would have led to her being the main antagonist, there was probably going to be a boss battle with Gravemind taking place. Bungie didn't get to do it but they left it in mostly unchanged, though sloppily. [Edited on 11.29.2012 6:47 PM PST]