>Johnson says it in one of the first chapters of Halo 2, its unmissable if you watch the cutscenes. He only says that on Heroic difficulty, lol.
I totally should play H2 on legendary though, its my favorite halo game and its also the hardest. I remember tartarus kicked my ass at the end, its like halo's only traditional bossfight and it shows.
I forgot about your duel with the monitor, I remember I walked off the platform like an idiot on my first playthrough.