It's not all about that. There's a rhythm you have to get into, a sort of groove where you become unstoppable. Every Halo game has had it, including Halo 2. You get to the point where you're annihilating everything in your path like the Terminator. It really comes more from understanding the AI and their patterns than memorizing spawn locations.
Unless you're fighting jackal snipers. Then it's just about memorization and avoidance <_<
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