In both A Song Of Ice And Fire and Game Of Thrones, Arya Stark’s time in Harrenhal is meant to be formative; as every possible avenue of protection and support is stripped away from her, she learns some hard lessons on how to stay alive and the cost (and value) of vengeance. But those lessons come from very different hands in the book and TV show. In , Arya spends her time in the shadows of the enemy-held castle, using the “three deaths” Jaqen H’ghar owes her to bump off nearby foes. When she realizes she’s been wasting her revenge on men of little importance, she manipulates Jaqen into helping her free Northern men from the dungeons. The men take back Harrenhal, making way for the arrival of Lord Roose Bolton. Arya becomes one of Bolton’s cupbearers, and though he treats her well enough, the two form no meaningful relationship. Contrast that with in the second season of Game Of Thrones: Tywin Lannister arrives at Harrenhal soon after Arya is taken there, and, recognizing her intelligence, he makes her his cupbearer. Over the course of a handful of scenes, Tywin offers Arya a different kind of father figure, one who substitutes the cold logic of battle and power for anything resembling human emotion. It’s unexpectedly brilliant character development for both characters. By replacing Roose with Tywin, the show both helps to make Tywin more of a presence in the series, and streamlines Arya’s arc, transforming what had been a largely internal journey into something more openly dramatic, if not quite as brutal.