Once you've discovered something, you can't go back and discover it all over again. Halo: CE wouldn't have nearly the same impact if none of the questions it raises were not answered by the end of it, which means that by the time the continuation of the story comes around, you are infinitely more familiar with the mythos and unique environments than you were as a Halo virgin. The fiction is set, the tone is set, even discovering new and exciting elements can never be more than building the first floor of the house on the foundations you built previously. And having built those foundations, you have a pretty good idea of what kind of house you'll be building later.
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