David Copperfield Forced to Reveal How He Does Famous Trick in Court Testimony

The magician has been sued over injuries a fan suffered during a performance at the MGM Grand in Las Vegas.

Legendary magician David Copperfield has been forced to pull back the curtain on a famous illusion as he faces a lawsuit from a former fan.

Gavin Cox is suing the magician, the MGM Grand and a construction company after he says he suffered traumatic brain injuries during a trick called The Lucky 13 in 2013. Each has denied blame.

"You're not responsible to him?" Cox's lawyer, Benedict Morelli, asked Copperfield when he took the stand in Las Vegas. "Yes or no."

"I don't think I'm responsible," Copperfield responded.

Cox was such a fan of the magician that he flew from his hometown of London to Las Vegas to see Copperfield's act on his birthday, and ended up taking part in one of his tricks.

It begins with Copperfield throwing 13 silver balls into the audience. The people who catch them are called to the stage, where they're suspended in a box.

A curtain drops and when it's pulled back again, they have all disappeared. They then reappear in the rear of the theater.

On the stand, Copperfield revealed that stagehands holding flashlights rush everyone out of the box. The fans are swiftly taken backstage through winding passages before re-entering the theater where Copperfield performs.

In court, the fans were shown outside the MGM before re-entering the theater where Copperfield was performing.

"It was total pandemonium," Cox, 58, said. "You don't know where you are going. It's dark. There are hands pushing you on your back."

He claims he fell into a construction zone and hit his head. He said he has had three neck surgeries since the accident and still needs assistance walking.

Morelli said he felt Copperfield was avoiding his questions.

"When you're asking questions of somebody and they're avoiding answers and they're giving speeches, obviously that's frustrating," he told Inside Edition.

Copperfield has now dropped The Lucky 13 from his shows. His attorney says the trick was performed successfully for over 15 years with more than 100,000 audience participants.