(Arya has just returned to Winterfell. There is still existing tension between the sisters. Sansa had already learned about Arya's training with the Faceless Men. Arya has found the letter that Sansa had written and decides to confront her with it. They are walking down a hallway and Arya is prefacing her accusation with a story about their father.)

Arya: Now he's dead. Killed by the Lannisters. With your help.

Sansa stops and turns to look at her: Excuse me?

Arya brings out the letter and begins reading: That's your handwriting. Septa Mordain used to crack my knuckles because I couldn't write as pretty as you.

Sansa sets her jaw and tries to remain calm: Arya, I know how it may look-

Arya talks over her: Robb, I write to you with heavy heart. Our good king Robert is dead, killed from wounds he took in a boar hunt.

Sansa: You don't need to read it to me I know what it says-

Arya: Father charged with treason, he conspired with Robert's brothers to take the throne from my beloved Joffrey-

Sansa eager to avoid a scene, continues down the hallway knowing Arya will follow her.

Arya continues louder: The Lannisters are treating me well and providing me with every comfort-

Sansa turning yet again into another corridor where most of the rooms where empty, as their occupants would be out training: Keep your voice down.

Arya even louder: I beg you, come to King's Landing, swear fealty to King Joffrey and prevent any conflict from House Lannister and Stark.

Sansa had entered one of the vacant rooms, Arya close behind eyes down ready the note.

Arya: Your FAITHFUL sister-

Sansa rounds and lands a slap across Arya's face. Arya drops the note, draws her dagger, and reaches for Sansa. Sansa knows Arya could kill her easily, but still struggles. Arya grabs the top of Sansa's dress, it rips a little, and pushes her against the wall, with the dagger at her throat. But Sansa is not afraid, she's enraged.

Sansa: Do you think I had a choice? Do you think anyone cared about what I wanted?

Arya: What? Did they torture you? Put you in a rake and stretch you until your bones started to pop?

Sansa only glares at Arya and that's answer enough.

Arya: You're always talking about the unity of the North, loyalty to our family. You were the first one to turn against our house for your precious Joffrey. I would have let them kill me before I betrayed my family.

Sansa is so angry she leans slightly into the blade just breaking the skin. Despite her situation, Sansa's voice is low, accusatory, even menacing: You have no idea. No idea, what it was like. (Sansa leans back examines Arya's face, practically a stranger's face.) But what else should I expect? What would a Faceless Girl know about being imprisoned by who and what you are? How was it, abandoning your name? You may not have betrayed us, you just left us behind!

Arya recoils at the suggestion, that's when she notices Sansa's dress has been ripped to reveal her shoulder, where a massive, ugly burn scar can be seen. It's technically from her time with Ramsay, but Sansa is not in the mood to explain herself. She looks away hoping Arya won't ask about it. Strangely, it de-escalates the situation as Arya considers Sansa's sudden self-consciousness about the scar and everything that it alludes to. Arya keeps the knife at her sister's throat as she takes a step back, pauses a moment longer, then leaves. Sansa takes a moment to adjust her clothing and her cloak. She notices the note on the floor. Whomever occupies this room wisely kept the fireplace burning, and Sansa throws the note into the fire before leaving.