Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 722

... the possibility of incorporating Felix’s magic into the school, it’s just that they had not been able to convince the Sorting Hat at that time. So she first calmly pacified some of the frightened students and faculty before returning to the Headmistress’s office.

Felix sat on the couch, appearing as if he hadn’t even changed his position – except for the additional Book of Runes that he held in his hand and read with great interest.

Professor McGonagall looked at him with a crit ...