Ok just watched the trailer for like the 5th time and had some questions and discussion topics. So what I noticed was that when after the chief saw the infinity crash landing and the big orange ball followed it, cortana almost sounded already like she had seen it. Does anyone else notice this? Also I was going to say that if this shield world does have the forerunners on it than since there are different biomes for diffirent species than could the ancient evil be something quarantined with the forerunners? My last question is that in an earlier post somebody guessed that the prometheans are not necissarily hostile and might be trying to capture the chief to release the didact, but in the spartan ops gameplay the prometheans killed the spartans. Can anybody explain this?
Are you referring to the E3 campaign demo?
Nope, I didn’t think Cortana sounded like she saw that orange ball before because she couldn’t identify it.
As for your second question, let’s just wait and see. 
1.)I just noticed that not only does Cortana seem like she has seen him, Master Chief sort of seems as though he has to. This is halfway through the campaign I believe so perhaps you encounter the “big orange ball” earlier in the game. 2.) I thought I had heard or read somewhere that there isn’t any forerunners on Requiem? I’m not exactly sure of this though so don’t take my word for it. 3.) Your last question says someone guessed. That right there I believe means that it is an assumption unless 343i has said anything about that.
> 1.)This is halfway through the campaign I believe so perhaps you encounter the “big orange ball” earlier in the game.
It’s about 1/3 of the way through the campaign.