LAS VEGAS (AP) — A Nevada jury is getting a rare behind-the-scenes look at a David Copperfield disappearing act after a British man claimed he was badly hurt as he participated in a 2013 show.

The executive producer of the Las Vegas Strip show testified Tuesday about the route that randomly chosen participants take during the illusion. The trick seems to make about a dozen audience members vanish onstage, only to reappear at the back of the theater at the MGM Grand resort.

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Copperfield is expected to testify in his defense as he faces a lawsuit alleging negligence.

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Longtime Copperfield business partner Chris Kenner told jurors that participants don’t know in advance that they’ll be quickly ushered through hidden passageways during the illusion dubbed “the runaround.”