What happens at the cemetery in The Phantom of the Opera?

Christine goes to have some "lone time" at her father's grave; the Phantom appears and begins to hypnotise her with music once more; Raoul appears, breaking her trance; he and the Phantom duel, and the Phantom is disarmed; Christine pleads for Raoul to spare his life; they leave and the Phantom declares war for both of them.

Also at the end of the movie, we see Raoul going to Christine's grave. He sets a music box with a monkey on her grave. When he turns to leave he sees a rose with a black ribbon and a ring. It shows that the phantom was visiting her grave too.

Sincerely,

Phantomfreak6377