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Sua suposição de que ele não perdeu seu poder (como em nível de energia, não habilidade) parece ser contradito pelo livro: ele estava exausto e severamente fraco:
'I've been better,' said Dumbledore weakly, though the corners of his mouth twitched. 'That potion... was no health drink...'
And to Harry's horror, Dumbledore sank on to the ground.
'Sir – it's okay, sir, you're going to be all right, don't worry –'
He looked around desperately for help, but there was nobody to be seen and all he could think was that he must somehow get Dumbledore quickly to the hospital wing.
'We need to get you up to the school, sir... Madam Pomfrey...'
'No,' said Dumbledore. 'It is... Professor Snape whom I need... but I do not think... I can't walk very far just yet...'Note aqui que Dumbledore mal consegue falar, com pausas. É bastante claro que ele teria problemas em fazer o que é considerado um feitiço difícil e avançado (Expecto Patronum) nessa condição; quando ele mal conseguia ficar de pé ou falar.
'Right – sir, listen – I'm going to knock on a door, find a place you can stay – then I can run and get Madam –'
'Severus,' said Dumbledore clearly. 'I need Severus...'
'All right then, Snape – but I'm going to have to leave you for a moment so I can –'Ver a Marca Negra fez com que ele alcançasse suas reservas, o que implica por que ele conseguiu a magia do último suspiro, como as defesas do castelo e o envolvimento de Harry:
'We need to return to the castle at once,' said Dumbledore. 'Rosmerta,' and though he staggered a little, he seemed wholly in command of the situation, 'we need transport – brooms –'
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Um segundo motivo seria que ele estava simplesmente conservando sua energia em coisas que ele tinha que fazer (que agindo como um mensageiro não seria) .... para ele, em seguida, pediu Rosmerta para se comunicar também:
'Rosmerta, please send a message to the Ministry,' said Dumbledore, as he mounted the broom nearest him. 'It might be that nobody within Hogwarts has yet realised anything is wrong... Harry, put on your Invisibility Cloak.'
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Uma terceira razão - para enviar Harry enquanto estava na torre de Astronomia - foi para proteger Harry . Dumbledore sabia que os Comensais da Morte viriam por ele por causa do trabalho de Malfoy:
'Go and wake Severus,' said Dumbledore faintly but clearly. 'Tell him what has happened and bring him to me. Do nothing else, speak to nobody else and do not remove your Cloak. I shall wait here.'
'But –'
'You swore to obey me, Harry – go!'
Harry hurried over to the door leading to the spiral staircase, but his hand had only just closed upon the iron ring of the door when he heard running footsteps on the other side. He looked round at Dumbledore, who gestured to him to retreat. Harry backed away, drawing his wand as he did so.The door burst open and somebody erupted through it and shouted: 'Expelliarmus!'
Harry's body became instantly rigid and immobile, and he felt himself fall back against the Tower wall, propped like an unsteady statue, unable to move or speak. He could not understand how it had happened – Expelliarmus was not a Freezing Charm –
Then, by the light of the Mark, he saw Dumbledore's wand flying in an arc over the edge of the ramparts and understood... Dumbledore had wordlessly immobilised Harry, and the second he had taken to perform the spell had cost him the chance of defending himself.