The most badass line that Master Chief said in the game was when he said “No, sir.” to Del Rio. I was absolutely astonished that the Chief would disobey a higher ranking officer. But if it was for Cortana, no surprise there. Also the the quotes that gave me the “feels” were all of the exchanges between John and Cortana near the end.
P.S. I think Cortana will inevitably come back in some way, shape or form.
Man, I have no idea why, but that one repeating line really weirded me out. It was very eerie, how Jul 'Mdama and the Covenant just… sat there for 3 years playing that over and over again. The fact that the Hesdurian Sangheili were so fanatical was just way too real and creepy. lol.
I love the line from the Spartan Ops mission where one of the “eggheads” says, “We’re like monkeys banging on a nuclear bomb because we like the sound it makes!"