O Cálice só pode cuspir o quarto candidato se estiver enfeitiçado. É preciso um strong charme para fazer isso.
MAD-EYE: The hell he is. The goblet of fire is an exceptionally powerful magical object, only an exceptionally powerful conjurer could have hoodwinked it. Magic way beyond the talents of a fourth year.
Mais tarde foi revelado que Barty Crouch Jr., que estava disfarçado de Olho-Tonto, fez isso e sabia o caminho para isso.
Mais tarde, perto do final do filme,
Harry Potter: It was you from the beginning. You put my name in the Goblet of Fire.
Do romance no capítulo 17,
“Because they hoodwinked a very powerful magical object!” said Moody. “It would have needed an exceptionally strong Confundus Charm to bamboozle that goblet into forgetting that only three schools compete in the tournament… I’m guessing they submitted Potter’s name under a fourth school, to make sure he was the only one in his category…”
Então, está claro que ele já sabia como enfeitiçar o cálice. E ele colocou o nome de Harry em uma quarta escola.
No 35º capítulo, Moody diz:
“Who put your name in the Goblet of Fire, under the name of a different school? I did. Who frightened off every person I thought might try to hurt you or prevent you from winning the tournament? I did. Who nudged Hagrid into showing you the dragons? I did. Who helped you see the only way you could beat the dragon? I did.”
O critério de idade foi estabelecido em 17, então Dumbledore colocou o feitiço ao redor da taça, já que, ao que parece, a taça não se preocupa com a idade. Harry não tinha dezessete anos, mas Olho-Tonto tinha mais de 17 anos, então ele facilmente cruzou a fronteira.
Do 12º capítulo,
“Eager though I know all of you will be to bring the Triwizard Cup to Hogwarts,” he said, “the heads of the participating schools,
along with the Ministry of Magic, have agreed to impose an age restriction on contenders this year. Only students who are of age — that is to say, seventeen years or older — will be allowed to put forward their names for consideration. This” — Dumbledore raised his voice slightly, for several people had made noises of outrage at these words, and the Weasley twins were suddenly looking furious — “is a measure we feel is necessary, given that the tournament tasks will still be difficult and dangerous, whatever precautions we take, and it is highly unlikely that students be low sixth and seventh year will be able to cope with them. I will personally be ensuring that no under-age student hoodwinks our impartial judge into making them Hogwarts champion.” His light blue eyes twinkled as they lickered over Fred’s and George’s mutinous faces. “I therefore beg you not to waste your time submitting yourself if you are under seventeen.
Então, em conclusão, Barty Crouch Jr. enfeitiçou a taça para que ela possa esquecer que há apenas três escolas participando. Mais tarde, ele colocou o nome de Harry nele e, como ele era o único candidato daquela escola falsa, o cálice cuspiu seu nome.