 "Primordium" is told through flashbacks, with a damaged Forerunner AI recovered by a human crew.This Forerunner AI, 343 Guilty Spark, was once the human Chakas, and relates his tale through flashbacks.After Chakas, Riser, Bornstellar, and the Didact were taken prisoner by The Master Builder, Chakas and Riser ended up on the Halo ring known as Installation 07.