It's been said before that the flood would take ages to actually infiltrate properly, requiring an already dead host that is for some reason not decaying. Some people are hard to infect, therefore the flood choose not to. John and Johnson are two such individuals.
I love a good challenge, a fellow Spartan Brother fallen to the Flood. I say bring it on! Lol, thank you very much. This actually my first ever attempt at the Flood. I was a little worried at first, but getting all these comments are really helping boost my confidence up.
Well, the flood were wiped out as of the Halo event triggered, so I guess 343 weren't that worried bout it, plus it would be very hard to come up with a full detailed flood model for every single armor combination.