Gilderoy Lockhart era um usuário do Obliviate muito muito .
“So you’ve just been taking credit for what a load of other people have done?” said Harry incredulously.
“Harry, Harry,” said Lockhart, shaking his head impatiently, “it’s not nearly as simple as that. There was work involved. I had to track these people down. Ask them exactly how they managed to do what they did. Then I had to put a Memory Charm on them so they wouldn’t remember doing it. If there’s one thing I pride myself on, it’s my Memory Charms. No, it’s been a lot of work, Harry. It’s not all book signings and publicity photos, you know. You want fame, you have to be prepared for a long hard slog.”
Considerando a quantidade de prática que ele tinha, seria muito bom agora. Demorou muito tempo para que Voldemort pudesse penetrar na mente de Bertha Jorkins.
He had tortured her. She told him a great deal. She told him about the Triwizard Tournament. She told him the old Auror, Moody, was going to teach at Hogwarts. He tortured her until he broke through the Memory Charm my father had placed upon her.
E Voldemort era o melhor usuário de Artes das Trevas na época, e demorou um pouco para reverter isso.
Além disso, os backfires tendem a ser magias diferentes das que o usuário está tentando transmitir.
“I don’t think there’s anything to do except wait for it to stop,” said Hermione anxiously, watching Ron bend over the basin. “That’s a difficult curse to work at the best of times, but with a broken wand —”
Ron, um segundo ano, não poderia ter feito isso. Então foi transformado em uma maldição diferente, com basicamente a mesma intenção.
O mesmo acontece com Lockhart. Ele conseguiu se virar contra ele e se transformou em uma maldição diferente, e agora a equipe de St. Mungos nem sabe o que fazer.
Mais provas de @Voldemort
According to the nurse, he was slowly improving, but he still doesn't remember a thing. He instinctively writes autographs to everybody. The healer responsible also mentions that nobody visits him, and is happy to see that he has visitors (Mistaking Harry, Ron & Hermione for people visiting him).
A motherly looking Healer wearing a tinsel wreath in her hair came bustling up the corridor, smiling warmly at Harry and the others. “Oh Gilderoy, you’ve got visitors! How lovely, and on Christmas Day too! Do you know, he never[ ]gets visitors, poor lamb, and I can’t think why, he’s such a sweetie, aren’t you?”
Eu não acredito que um encanto de memória normal funcione dessa maneira, mas se alguém puder me desaprovar do que eu tirarei essa parte.