Halo 4 Easter Egg - Red Versus Blue Voices

First off, go ahead and enter the Spartan Op's menu. Start up Chapter 4 - Episode 3. As the mission starts, quickly take a look to the right and look up. You will see a alien-type disk on a branch, and its on top of the tree. Shoot it,with a long range weapon(DMR,Battle Rifle etc.). Go ahead and let the cutscene commence, you will hear the voices of Ray and Geoff from Rooster Teeth.