The librarian was tied up with silver binding, nothing would cut that other than his own wand. She was gagged and she was begging. The latter pleased Tyrin but he muted it from his ears to continue with his work.
He had assembled every book in the entire library containing any information on the praising of creatures such as werewolves, goblins and other beasts. The pile was massive but with one wand flourish the entire set burnt rapidly to ash.
Tyrin had a moral duty to end any kind of kindness or sympathy with the vile beasts that had caused Voldemorts return, in his mind. The Dementors had sided with him, the werewolves had to. Creatures who had such power were untrustworthy and were could for enslaving or destroying. It would end here.
"Obliviate," the Librarian went unconscious. "You will remember nothing, I have not been in this library for several weeks. A house elf came in a started to burn books. He laughed and hurt you."
Tyrn smiled and kissed the woman leaving a burning scab on her face. Then, he walked tot he door.