Nina, as the White Swan, gets through the first scenes of the ballet okay but panics during the 'Dance of the Swans' when the faces on all the swans begin to look like hers, causing the Prince to drop her, which enrages Thomas. When the scene is over, she returns to her dressing room in tears and sees Lily seated at her vanity in costume for the Black Swan. Snottily, Lily offers to dance the Black Swan for her. Enraged, Nina yells, 'Leave me alone!' and smashes Lily (who has turned into the double) into a mirror, shattering it into bits. When the double tries suffocating her, Nina stabs her in the abdomen with a shard of mirror. She hides the body (who now looks like Lily again) in her bathroom and dresses for her turn as the Black Swan. Back onstage, Nina dances with abandon, wowing her partner as well as the audience. Suddenly, she begins to physically transform, her arms become black wings. As the audience gives her a standing ovation, Nina exits the stage, kisses Thomas passionately, and returns to her dressing room to change back into the dying White Swan, first covering up the blood on her floor with a towel. As she finishes with her makeup, she hears a knock at the door. It's Lily, alive and well, congratulating Nina on her amazing performance. When Lily is gone, Nina looks under the towel to find there is no blood. Suddenly, she becomes aware that she is bleeding from her abdomen and pulls out a shard of glass from the broken mirror. Despite her wound, Nina dances the last act until it becomes time for her to commit suicide. As she prepares to throw herself from the 'cliff', she looks out over the audience and sees her mother (Barbara Hershey), smiling and crying. As Nina falls onto the mattress below, the blood stain begins to widen. The audience erupts in thunderous applause. The rest of the dancers gather around her, and Thomas invites her to take her bows. 'My little princess,' he says, 'I always knew you had it in you.' Suddenly, Lily gasps, and the blood stain can be seen across Nina's entire abdomen. Thomas calls for help and asks Nina what she did. 'I felt it,' she replies. 'It was perfect.' The crowd continues to roar with applause as the screen slowly fades to white.