Rtas 'Vadum in crashed Flood ship

From Halopedia, the Halo wiki

The supposed body of Rtas 'Vadum

The Rtas 'Vadum in crashed Flood ship phenomenon is a glitch that can be found on the Halo 3 Campaign level Floodgate.

When you jump down the hole into the Unnamed Flood-Captured Battlecruiser's Crashsite, there will be a couple of dead Ultra Elites lying around. Sometimes, one or more will have Rtas 'Vadum's face, in which two mandibles are missing. You can get it infected, too, if you push it down the hole and shoot some Flood Growth Pods to release Infection Forms. When the Elite turns into a Flood Combat Form, his armor remains silver, but changes to default blue -- like all infected Elites -- when the body is destroyed.