The Dark Lord reached into his robes, took out a Knut, and flipped it to her. “Klaudia Alicja Tabor, I command you thus. Take this Knut to the spell circle I showed you beneath the Quidditch stands and put it in the center. Then Obliviate yourself of the last six hours.”
“Yes, lord,” the witch said, bowing to him, and went on her way.
“I thought—” Harry said. “I thought you needed the Stone to—”
The Dark Lord was still smiling, he had never stopped smiling. “I did not say that part in Parseltongue, child. All I said in Parseltongue was that I had set events in motion to kill students, events that I would stop if I obtained the Stone. […]”
Some usage of the Imperius curse seems most likely to me. Or a Death Eaters using polyjuice. There are so many ways for LV to manage such things that it doesn’t really matter how exactly he did it. ;)
It was briefly noted in chapter 111:
… … … someone else at the school knows that Quirrel was doing something weird, and called him lord.
Mind magic, or their own will? Obliviation, but was the entire inception of that loyalty during that six hours or does she remember anything?
Some usage of the Imperius curse seems most likely to me. Or a Death Eaters using polyjuice. There are so many ways for LV to manage such things that it doesn’t really matter how exactly he did it. ;)
Thanks, not sure how I missed that.