BTW I hope it's all a ruse, other wise the show runners changed of my favorites so much I'm starting to dislike her. They making Arya into a hypocritical dumb cunt. Talk about complete detour from the character that was the favourite of so many.
Tho I liked how she revealed the faces to Sansa, that whole dialogue and thought process seemed so dumb from her.
Something fishy about Sansa. Is she sending away Brienne because she is considering "dealing" with Arya? Little finger told her Brienne is vowed to protect you both, so she wouldn't allow either harming the other, and as soon she hears that Brienne goes off to meaningless trip.
Another far reaching guess, but which I'm considering because they showed us the faces, is it really Little finger who is talking to Sansa? He sounds more overt and direct in how he is "advicing" Sansa, smirking bit extra too lol. Maybe paranoid, but Arya was flaunting her capabilities in the earlier scene.
But probably not since it would require her killing Little finger, and that just doesn't die off screen. Another far out possibility is Jaqen in disguise to keep an eye out on Aryas development.
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