In "Game of Thrones" season 7 episode 6, "Beyond the Wall," we saw a very tense Sansa and Arya scene in which Arya threatened to kill Lady Stark. This is not the first time Arya questions her sister's loyalty and threatens her. Why is Arya acting so bluntly in the last few episodes? A new theory by a Redditor explains her behavior.

Did Arya really hate her sister so much?

Arya comes off like a psychopath in "Beyond the Wall." She even threatens to kill Sansa. Arya moved from subtle insinuations to openly messing with Sansa, creeping her out with her bag of faces and her threats.

Although the two sisters used to fight when they were children, Arya's behavior looks exaggerated and paranoid to many fans.

Sardorim's theory: lots of people are actually being conned by Arya

In a short but brilliant post, Reddit user Sardorim draws the fans' attention to several details. According to Sardorim, Arya is the one who is acting smart. When she reached Winterfell, she was happy to see her sister. Arya is far from being a naive girl, as she proved by destroying the entire House Frey. She's also able to change faces, an ability that she isn't using at the moment.

According to Sardorim, Arya is not using her ability because she wants Littlefinger to see her, Arya Stark, doing what she chooses to do.

It's interesting to note that Arya's senses are enhanced, she's an extremely skilled assassin, and she might actually know that Baelish has been following her. This means that our little assassin is mistreating Sansa to trick Petyr Baelish into thinking that his plot to divide the Stark sisters is working.

Here's why Sardorim is likely to be right

If Arya is pretending to be mad at Sansa to trick and finally expose Littlefinger, her speech about the "Game of Faces" becomes meaningful. As Reddit user ekbowler noted, after explaining the game of faces Arya says that she's going to lie. "Back in Braavos, before [...] there was a game I used to play — The Game of Faces.

It's simple. I ask you a question about yourself, and you try to make lies sound like the truth. If you fool me, you win. If I catch a lie, you lose. Let's play." Arya is playing the Game of Faces, where the players are supposed to lie! Moreover, after her threats to Sansa, Arya gives her the Valyrian steel dagger.

If Sardorim and ekbowler are right, Arya actually knows about Littlefinger's plan to tear the Stark sisters apart, and this means nothing good for Littlefinger!