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Will the flood unexpectecly return in the game???
Die? Haven't you heard? Spartans never die.
They can't without causing a paradox in the timeline[Edited on 08.10.2009 8:29 AM PDT]
my theory, I don't think so, unless there is some underground tunnel with them, or if they get there on a ship, but, as with ODST, I don't think we will see them.
Signatures are for squares.
Most likely no, as that would directly defy the canon from Halo: CE.