A Reddit user has put forward his fan theory, and we have to say, it’s a good one. This is what they think:
“When Bran reunites with Sansa at Winterfell (S7 EP3) he very clearly does not embrace her back when she is hugging him (we see a view that shos his hands remain by his side). In fact, while Sansa hugs him he stares blankly beyond her (which yes, I recognise is kind of his thing to do now).
“However, when he reunites (S7 EP4) with Arya he does hug her back (a view is shown with his arm around her) and while his face is still blank-ish, there definitely appears to be a hint of concern as he stares over Arya’s shoulder at Sansa (who looks down).
“Bran knows that something is not right with Sansa and that she will likely do something that hurts her family. He made a point of arming Arya with that dagger, which he can see she will have to use for some reason not yet known to us. Will she have to kill Sansa? Only Bran knows for now.”
We’ll just let that all sink in for a moment.
Interestingly, other Game of Thrones fans disagree.
“I would take this as a sign that Bran is becoming more and more like a regular person again as he progresses with his new abilities,” says one.
“I have a feeling just the opposite is the case,” says another, who believes Sansa will kill Arya.
There’s only one way to find out.