Visible crew/equipment: In the Room of Requirement, during the Patronus lesson Harry walks behind Ginny, who stands between two other girls, and she says, "Expecto Patronum!" As the Patronus exits her wand, just before the shot cuts away, in the reflection behind the girls we can catch a glimpse of the camera, cameraman and crew member wearing a short-sleeved tee, between and behind the reflections of Ginny and the blonde girl. (01:22:05)
Visible crew/equipment: After Crookshanks runs off with Fred and George's Extendable Ears the twins apparate and startle Molly, and when it cuts to Molly asking Harry if he's hungry, the actor's L-shape tape mark can be seen on the floor behind Arthur. (Only visible on fullscreen DVD). (00:15:00)
Visible crew/equipment: When Harry is walking out of the Dursley's house with Moody and the others, as they walk across the front of the house, just after Kingsley says, "Dumbledore has persuaded the minister to," on the left-hand side ground floor window the reflection of the moving reflector screen is visible. (00:08:40)
Visible crew/equipment: When Harry and Dudley get attacked by the Dementors near the start of the movie, when Harry runs over to Dudley after he casts a spell on the Dementor, you can see the microphone wire underneath Dudley's shirt whilst he is lying on the floor.
Answer: When Voldemort originally attacked Harry, he was acting on information provided to him by Snape. But Snape's information was not complete, ergo why Voldemort lost his powers. He wants the prophecy in order to hear it in its entirety, because he believes it will give him the information he needs to kill Harry.
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