Without a Legilimency Spell, John Lithgow is confused by how J.K. Rowling could be both the person wrote the Harry Potter books and the person who espouses anti-trans opinions online.

Lithgow, who’s set to play Hogwarts headmaster Albus Dumbledore in HBO’s Harry Potter television series, sounded off on the subject at the International Film Festival Rotterdam on Sunday.

Originally published on tvinsider.com, part of the BLOX Digital Content Exchange.