Dozens of Dementors emerge from the darkness while one descends and attempts to suck out the riders' souls. This effect is achieved by projecting the riders' faces onto a cloud of fog in front of the Dementor, blasting cold air towards the riders, and using a heartbeat-like sound played through the sub-woofers built into the benches. (Though the fog effect is not present in the Hollywood version and is instead replaced with dozens of dementors surrounding the guests) After shaking the riders out of the trance, Harry causes the Dementors to flee with a protective Patronus Charm. After the final Dementor, and while Harry uses his Patronus, the riders enter the final video dome segment, where the cliffs outside the Chamber of Secrets cave in. They fly over the Black Lake, back into Hogwarts and through the Main Hall and Grand Staircase, where they are shouting wildly on by a series of onscreen characters from the movies who appear three-dimensional. Professor Dumbledore sends everyone back through the Floo Network to the Room of Requirement, where they exit their bench.
