Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
Level: Great Journey
It doesn't matter what difficulty you play on, but if you proceed through the level Great Journey and you get to the end of it (the part just after Johnson destroys the door to Tartarus), if you hijack a brute-controlled banshee, then the brute that gets kicked out of it will not attack you. He won't even have any weapons. He just follows you around like a stalker until you kill him.