Other mistake: Zombies - Origins: On this map only, there is a power up you can get called Zombie Blood that will make the player invisible to zombies for a short period of time. When under the effects, the player cannot hear any sounds in the environment around them, no gunfire or other zombies, except their own character's voice and grunts. That is how the power up works. If playing on split screen, and the second player gets Zombie Blood, the effects happen this way as normal and the first player is not affected. However, if player one gets it, the sound is also muted on the second player's screen as well.
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