Just the show, since it was Game of Thrones. Figure book readers would go by the actual name.

There’s a short scene when he’s messing about in the past were he pops over to the King, and if I remember correctly, that’s when the King goes mad. Shouldnt be long after the Hodor scene. It’s been a few years. But I distinctly remember being like ‘wait, it was his fault!? That little shit!’