Williams on how she channels Arya's grief and capacity for violence: "I drew on a lot of very real emotions that I felt in my life. People would always say when I was 12, 'How could you ever — what did you draw on?' They just don't know anything about my past. It's such a freeing thing being able to explore these emotions in a really safe environment. I think it was really helpful for me when I was 12, 13, to just, like, go crazy, and then you go home and you're like, 'Phew, what a good day.'"
On Arya's bloodiest moments: "You can feel the adrenaline. It feels incredible because it's all pretend, it doesn't matter. But when else do you get to do that? There was this shot we did at the end of season three when I'm stabbing the guy in the neck. They got me a sandbag and a fake knife, and they had blood going, and they were just like, 'Stab! Just go for it.' My God! It was good."