From Halopedia, the Halo wiki
Note: Halo Waypoint names Terminal Three as "Charum Hakkor" and Terminal Four as "Flood". The subject matter of each terminal makes it clear that these titles were erroneously swapped at some point in the game's production. The article restores the titles in accordance with 343 Industries' original intent.
As human children play games, the camera pans to where the Didact and the Librarian watch the village.
A pair of hunters return to the village, carrying their catch. They present it to a woman.
Space, on a collection of infected ships. Forerunner Warrior-Servants stand before a door, weapons trained on it. Bangs and growls can be heard beyond the door. The door explodes inwards, and the Forerunners are consumed in a bright flash. They are then seen being converted to Flood.