[quote]Isn't it mentioned that the forerunner created the flood?[/quote] No, the Forerunner encountered the Flood when the Flood invaded the galaxy. [url=http://halo.wikia.com/wiki/Forerunner-Flood_War]Forerunner-Flood War[/url] from [url=http://halo.wikia.com/wiki/Main_Page]the Halopedia:[/url] "The Flood entered the Milky Way galaxy at approximately 98,379 BCE, and initially caught the Forerunner military by surprise at G617 g1 using captured non-military vessels to penetrate local Forerunner naval blockades to descend and land upon Forerunner-colonized worlds..."