- last post: 01.01.0001 12:00 AM PDT
I can tell you what i think and its very resonable. Installation 04 the ring Chief was on was built to study and contain the Flood. The Forerunners could have built other rings, but we don't know, but they only need one to study and contain the Flood. That ONE ring called Installation 04 was blow up getting rid of the Flood and anywhere it could have possibly gone, thus the Flood is gone forever and never coming back wether thats on Earth or another ring world.