the flood will be back, how did they get to earth? remember those marines that found the flood. (Sarge etc etc) well most of them had a genetic mutation that stopped the flood from infecting them. they escaped in a pelican, but there was still some flood spores hanging around them. So in the E3 footage where we see sarge talking, he probably infected those two pilots. The ODST's and MC were probably safe because of their suits. But hey, theres a decent reason for you.
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