Reply #20: According to IMDB

[RSillsbee]

that scene was actually filmed backwards the actors were actually lowered down and then the film was reversed


The "Carousel" sequence is one of the most complex flying wire stunts ever done for a motion picture. A circular rig was constructed above the set, designed to rotate in sync with the revolving floor plate below. Initially, the performers were all supported by a single winch driving the mechanism for their thin support cables. Unfortunately this resulted in the cables becoming tangled during rehearsal; each stuntman had to be untangled and brought down from the rig in a maintenance lift. The rig then had to be redesigned so that each stuntman was on their own separate winch, with all of the winches connected to a "panic" switch that cut the power in the event of an emergency. For reversal shots, the white crystal on the arena ceiling was built on the floor of the stage, and the performers were lowered down towards it. These shots were then filmed upside-down so as to make it appear that the performers were moving upward.