During the liability phase of a bifurcated personal injury claim against magician David Copperfield and several other defendants for an accident that allegedly injured Gavin Cox during a show in Las Vegas at the MGM Grand Hotel, the trial judge permitted defense attorneys to show jurors surveillance videos — as “impeachment by contradiction” — because Cox reportedly needed assistance walking to and from the witness stand during two days of testimony.With two justices dissenting, the Nevada Supreme Court affirmed. Cox v …