Wicked: For Good | Behind the Scenes of Glinda and Elphaba's 'Witches Duel' (Exclusive)

ET has your exclusive behind-the-scenes look at the making of 'Wicked: For Good,' now available to buy or rent on digital, at home. Ariana Grande and Cynthia Erivo spill secrets from filming Glinda and Elphaba's 'witches duel' on the Yellow Brick Road, which Ariana dubs it one of her 'favorite scenes' from the film.