The words are in Old English, not Latin, and he’s just aware enough to widen his eyes as she starts. He’s unconscious before she’s half way through and his heart is slowing faster than the words are leaving her. She can’t stop though. If she does, it’s all over. She can’t do anything until the spell is finished and she forces herself to concentrate. As soon as the last word ends she spells him clean with a vicious slice of her wand, washing all traces of her and her dungeon off him and with another flick he’s gone.