On the level just after the silent cartographer,you will be dropped off by a pelican in the caves.when you jump out, momentarily a "press x to board side seat of pelican" appears. Press it! you will board it and as the elites and grunts come in, the pelican will fly away, with you in! don't press x or you will fall down and down. The pelican will fly down and into a deep chimney like thing. it will then enter a green cloud. you will then fall out, but if you press x went it says, you can flip the pelican. after this you will die.