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The Odd Flood Glitch can be performed on any level with Infection Forms and grenades in Halo PC and Halo: Combat Evolved. Basically, when the Flood Infection Forms are draining your health bars (i.e. when your shield is down), right before you die, throw a grenade. The camera will behave just like you died, but your body models completes the animation (and the throw) of the grenade being thrown.