If they kept them for research, it makes perfect sense to think that in the course of the research, there was an uncontrollable outbreak. They wouldn't keep the Flood in hopes of researching them after they die, they would keep them to research them, then activate the rings when things get out of control.GrizzlerBorno said:This would be true if the Flood actaully made any sense in the story. They didn't.Thaius said:You're missing the point. The Flood was not there because they made for good gameplay, the Flood was there because they made for a good story. The first time playing through Halo, fighting them was fine for someone paying attention to the story because they were a mysterious and scary enemy, the ultimate secret held by these ancient constructs. Thankfully, some small things about how they were fought in each game made them bearable on the first playthrough. Subsequent playthroughs not so much, but anyone who cares about Halo's story (because it is a great sci-fi war story) didn't mind on the first time through.
In Halo Wars, that was just an unforgivable betrayal of canon. It made no sense at all for the Flood to show up then. Humanity had no idea the Flood existed until the events of Halo, so for any humans to discover their existence before then is just a horrible canonical failure. That's what happens when Bungie completely withdraws from a project; it made sense to have it designed by Ensemble, but they should have had their own creative team do the story and music.
The forerunners built and activated the Halo Network to kill all sentient life in the galaxy to starve the flood to extinction.........BUT kept samples of the Flood ON halo? WTF? How did they even survve on halo without having anything to eat for a 1 million years or whatever?
I believe the reason cited for this was: They were kept for further research purposes. Research by whom? The forerunners died off when the Halo network activated, so who's going to research them?
As for how they survived, it is seen in the games that the flood spores can enter the bodies of other previously flood-infected bodies. Considering the size of the outbreak in the days of the Forerunners (that is to say, freaking HUGE), it would make sense to think that they could survive off each other for a long time to come in the areas most densely populated by them (mainly the rings themselves and other Forerunner structures used to house them).
Not that hard to explain.