[quote]My point is if they had a limited supply of energy they wouldn't have wasted it by placing some much biomass that served no purpose. [/quote]It actually does serve a purpose. High Charity isn't exactly the most stable space station, and since it was built around the Keyship that is no longer there, it's going to be fragile. The Flood biomass was used to support the weakened superstructure, as well as allow the Gravemind to directly alter slipspace to allow quick and safe passage to the Ark. [url=https://www.halowaypoint.com/en-us/community/blog-posts/canon-fodder-feet-first][i]His modifications to High Charity were far-reaching, both to keep the facility functioning after the departure of the Keyship, and to better serve as a mobile plagueship from which he could sing victory everlasting in a galaxy consumed of thinking life. But even with an intellect impossibly vast and deep, able to twist the technologies of the Covenant far beyond their original functionality by application of esoteric Precursor science, the ancient abomination was unable to both conduct a desperate bridging maneuver to the Ark and maintain the structural integrity of High Charity after its arrival.[/i][/url] [quote]The energy requirement would be enormous, we humans put about 40,000,000,000 tons of pollution into the atmosphere for year. Or about 110 million tons per day. In order for the flood to convert the the planetary ecosystem to a flood state within the mere hours/days it usually takes, they would have to pump vastly more flood spores into the atmosphere than this.[/quote]I don't really see how our pollution emissions are comparable (or even relate) to FSC spores being launched by a spore mountain. If you want to find a good comparison, I'd look at fungi - specifically [url=https://youtu.be/XuKjBIBBAL8]cordyceps.[/url] It's more about the virulent nature of the spores rather than filling up every square inch of atmosphere with them. [quote]Going by these quotes systems are solar system.[/quote]I do agree, though my questions still stand as there are many, many unknowns about the 12 systems and their quarantine. [quote]That was after the flood escaped containment, where they then proceeded to take over two thirds of the galaxy in a mere 10/4 years.[/quote]Halos were designed with that strategy in mind before the Flood returned from their defeat during the human-Forerunner wars. [spoiler]Aha! You've got responses hidden inside the giant quotes! Easy to miss those.[/spoiler]