Invader of the Opera Part 5

My fifth one. Let's say Raoul and Christene (Dib and Gaz) are talking of a story as he calls her "Little Lotte". Raoul wants to take Christene, but she said that the Anfel of Music is strict. When Raoul leaves her for a while, the Phantom (Zim) came as he lures Christene to come to his lair. Raoul hears the Phantom's voice as he tries to open the door, but the Phantom locked it when Raoul left.