En troll är bara ett annat sätt att kanalisera magi, och den magiken kanaliseras med kärnan som är innesluten i träet, om det är en trollstav!
Det är mycket möjligt att Hagrids trollens kärna finns i paraplyet, men jag tror verkligen att kärnan skulle ha blivit bruten. Jag tror att Dumbledore bara gick framåt och gjorde en reparo
som Harry gjorde i Dödliga Hallows.
I Sorcererens Sten tar Hagrid Harry till Olivander för att få sin troll, men Olivander känner igen Hagrid (inte svårt att göra) och frågar honom om sin trollstav.
"Rubeus! Rubeus Hagrid! How nice to see you again.... Oak, sixteen inches, rather bendy, wasn't it." "It was, sir, yes," said Hagrid.
"Good wand, that one. But I suppose they snapped it in half when you got expelled." said Mr. Ollivander, suddenly stern.
"Er -- yes, they did, yes," said Hagrid, shuffling his feet. "I've still got the pieces, though," he added brightly.
"But you don't use them." said Mr. Ollivander sharply.
"Oh, no, sir." said Hagrid quickly. Harry noticed he gripped his pink umbrella very tightly as he spoke.
"Hmmm," said Mr. Ollivander, giving Hagrid a piercing look.
Hagrid ljög två gånger, hans trollstav var inte i bitar (inte längre) och han använder fortfarande den, men bara under Dumbledores tillstånd.
Harry Potter wikia föreslår möjligheten att Dumbledore kan ha reparerat Hagrids trollstav!
Following his expulsion, the Ministry of Magic forbade Hagrid from practising magic and destroyed his wand. Albus Dumbledore nonetheless convinced then Headmaster, Armando Dippet, to give Hagrid the job of Gamekeeper and allow him to remain a resident of the school. Hagrid continued to do magic using his pink umbrella, which most likely contained the broken fragments of his wand, or perhaps even his entire wand intact, reconstructed for him by Dumbledore using the Elder Wand.