most people will probly disagree with me but it would be a great challenge on the higher difficulties
they already does that
Well, there are often times where you are fighting the Covenant and the Flood at the same time, though they are not working together against you as I think you’re suggesting, (in fact the Flood only ever team up against the covenant, once in Halo 3 to keep the array from firing.) so, canon-wise I would have to disagree with you, though I’m sure it would add a new dynamic into the fighting.
-IV
i agree with him^