Wasnt that scroll Sansa's letter from Kings Landing from Season one or two where she is telling her whole family to bend the knee to Joffrey? That will go over well with Arya.
Also, I loved the fact that Arya just dismantled Sansa telling her she is the superficial selfish brat we all know her to be.
It is from when after Ned died. Cersei had Sansa write to Robb telling him to bend the knee to Joffrey and that her father and stanis tried to take the throne after Robert died.
I think the aim here is to drive a wedge between Arya and Sansa so that the former will leave the North. IF believes that Jon is as good as dead fighting on multiple fronts and that when trouble comes to Winterfell he can convince the Lord's and Sansa that she should marry and marry Him. That way if the Iron Throne becomes vacant or he can can swoop in as the strongest remaining army. As he said, assuming the dead don't overrun the place.
He won't die this season unless they continue to move the plot along at warp speed.
I mean if this is the case, they could have cut Dany's spring break in Essos a bit short couldn't they?
This episode was written like a sitcom. More multiple cross continent trips, yet Cersei is still sporting her walk of shame haircut??? Should have grown out by now?