up view as it hit the ground, while  keeping the camera still. In order to get a better looking scene in  reverse, they didnt simply film it forward and reverse it in  editing. They actually fed the film through in reverse, making a  crisper picture. However, this specific shot was not meant to be  filmed in reverse. It was done accidentally, and so they had to, in  editing, reverse it. That means its a shot of a simulated reversal,  recorded backwards, and then manually reversed to get the desired  effect.