One thing I was thinking about, which might not make the best sense, but who was Sansa writing to ask for help? I'm assuming it was Littlefinger, but she now knows that the Blackfish is alive and has a force. Maybe, just maybe, she's contacting him? I don't see the Blackfish leaving Riverrun, but what if they play the slow con where they surrender Riverrun, go help take Winterfell, then the force united returns to Riverrun?
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