Near the end of the movie when they are in the Phantom's lair for the last time the Phantom puts a ring in Christine's hand. A few seconds later, she pulls a curtain off of a mirror with both of her hands. Shouldn't she still be holding the ring? They don't show her put it anywhere or drop it. Later before she kisses the Phantom she has the ring in her hand and puts it on her finger. Where did the ring go, and how did she have it later?