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I always offer fair game and usually allow some "extermination" of my teammates. I think that anyone should be able to play Halo or any other game they please.
Who unleasshed the flood? 343 Guilty Spark said someone unleashed it,but who?
The Almighty Darklord
The Covenant, I'm pretty sure.
It was the flood. GS 343 mentions "the other species currently on the ring", which is technically not correct because there are more than one species in the Covenant, but that is parsing words.
All the evidence suggests that the Covenent released the Flood. The helmet cam from Jenkins showed the Covenent were there first from the Elite bodies they found and later on second squad reports contact with another enemy that wasn't Covenent.
In the Halo 2 Limited Edition case, it has the convos from the universe. Says the covenant, but since the Elites are the computer users, it's safe to assume it was an Elite.