args.bungie.org

Flood requires creatures large enough to take over... but all of life wasn't destroyed (think microorganisms.. maybe plants?). Perhaps the rings force multicellular organisms to break apart, forcing their cells to split off away from each other. That would ensure no bones or dead bodies left behind ...

this is all VERY confusing. the comic says that the humans do not know where the sentinels came from, yet in the audio recording the voice sounds strangely human, of course it could be as simple as one human tribe was more advanced then the other or something to that liking. we cant be sure. bt her...