A "cut" is when a filmmaker literally cuts the film and splices it together with the next piece of film. In this case the writer is talking about having one camera viewing a scene from one angle, and a second camera on the same scene from a different angle. As you are watching the completed film, you see the scene from the first angle and then suddenly you see the scene from the second angle.
In this experiment, however, the filmmaker has fooled you. He has not cut to a second angle of the same scene, he has cut to a different angle of the same location, but with an entirely different actor.
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