- last post: 01.01.0001 12:00 AM PDT
the ark doesnt necessarily create a shield around earth. hell, we're not sure what the ark actually does aside from activate all the halos. it might not actually be the safe haven we're thinking of. instead of being noah's ark it could be the ark of the covenant....
we also dont actually know if that is the ark. something tells me that either isnt the ark, or that scene isnt really happening in real life. that or time travel will somehow come into play :p
also, i would think that cortana would be giving this message, if it were anyone. we dont know if gravemind controls cortana or just about anything onvolving cortana and gravemind. however, towards the end of her speech you can see a look of sadness/sympathy for the chief. i think that cortana still cares for the chief, even if she is being controlled by the gravemind.