Read Human Weakness in Evolutions. Cortana was being tortured by the Gravemind. She thought he wouldn't be able to hurt or or anything. She was extremely wrong.

The most detailed account of what happened is in the Halo: Evolutions short story "Human Weakness," you should check that out if you're interested in finding out more.

[quote][b]Posted by:[/b] Maxpower772 Okay, I've beaten the Halo Trilogy and this plot hole annoys the hell out of me. So, since Sierra 117, you keep getting -blam!- up messages from Cortana. Telling you -blam!- that makes no sense, like..."For a moment of safety, I unleashed fury on the stars" or something. And then by the time you get to her level she's all green and like "I AM A MONUMENT TO ALL YOUR SINS" and making sex noises. And then when Chief gets to Cortana everything's cool and nobody gives a -blam!-. Uh...what?? So can somebody tell me what the -blam!- happened between Cortana and Gravemind from the ending of Halo 2 to the end of Halo 3? And just don't say "They had a Q+A", that helps nothing. Thanks. [/quote] Its called orgasm... [quote][b]Posted by:[/b] ROBERTO jh Cortana was being tortured/hacked by the Gravemind to break her, and get her to reveal her secret (which was: she has Halo's key). Basically, she was cyber raped. The strange messeges were telepathically sent to Chief by the Gravemind to lure him into a trap, which he survived. Edit: is -blam!- not censored any more? Edit 2: guess it is...well, if I get banned/warned, not my fault.[/quote] Your answer...

[quote][b]Posted by:[/b] ROBERTO jh Cortana was being tortured/hacked by the Gravemind to break her, and get her to reveal her secret (which was: she has Halo's key). Basically, she was cyber raped. The strange messeges were telepathically sent to Chief by the Gravemind to lure him into a trap, which he survived. Edit: is -blam!- not censored any more? Edit 2: guess it is...well, if I get banned/warned, not my fault.[/quote] Thanks. That answers my question.

[quote][b]Posted by:[/b] ROBERTO jh Cortana was being tortured/hacked by the Gravemind to break her, and get her to reveal her secret (which was: she has Halo's key). Basically, she was cyber raped. The strange messeges were telepathically sent to Chief by the Gravemind to lure him into a trap, which he survived. Edit: is -blam!- not censored any more? Edit 2: guess it is...well, if I get banned/warned, not my fault.[/quote] It's base form isn't, but variations aren't which I find pretty damn weird.

read the books, basically the gravemind was controlling what cortana was saying while she was slightly rampant, when john rescued her, he felt that she was slightly different but did nothing of it because he had to get out of the flood invested high charity

Cortana was being tortured/hacked by the Gravemind to break her, and get her to reveal her secret (which was: she has Halo's key). Basically, she was cyber raped. The strange messeges were telepathically sent to Chief by the Gravemind to lure him into a trap, which he survived. Edit: is -blam!- not censored any more? Edit 2: guess it is...well, if I get banned/warned, not my fault. [Edited on 02.25.2012 4:03 PM PST]