qqp question1: In Harry Potter 2, Harry gives Mr. Malfoy Voldemort's diary in order to free Dobby, Lucius takes it with him. How did Dumbledore (in the film, can't remember about the books) possess the diary again in HBP? question2: Why does only Harry Potter have to kill Voldemort if Dumbledore had the strongest wand in the world? Couldn't he have killed him himself?