- last post: 01.01.0001 12:00 AM PDT
"I have defied Gods and Demons"
I think the Gods refer to the Forerunner and the Demons are the flood, more specifically Gravemind. This makes sense so far... It would also imply that she hasn't been turned by Gravemind.
If she has merged with Gravemind this could be Gravemind saying that he has defied the Forerunner and the Covies.
"I am you shield, I am your sword"
I don't think this needs any explaining.
"I know you, your past, your future"
I like the theory that this implies time travel. Cortana would know his past and future (they are one in the same) either from when she plugged into the first Halo or from a merge with Gravemind.
His future would be going back in time to throw the switch, or maybe destroy the Halos this time? The latter would solve the whole never ending cycle problem. His past would be his childhood and his future (from some perspectives) as it has already happend technically.
"This is how the world ends"
Cortana is showing the chief how the covies destroy the galaxy, and he must stop it from happening.