Okay, obviously Sansa is obnoxiously naive and would probably sell out her entire family to get to have a royal wedding. But I think she did a great job there. She presented a line of argument that would allow Joffrey (and Cersei) to let Ned out of prison without losing face, and if Ned would accept it, he might actually get to go home. Obviously he might not want Joffrey to be king, and obviously he might not think Joffrey ought to be king, but it's hard to argue against the fact that Joffrey is king. He's up there on the throne, issuing pronouncements! All Ned has to do is shrug, admit that he lost, and tell Joffrey he was in a poppy-fueled daze. It doesn't seem like he's going to do that, but Sansa did a great job identifying the line of play that could save him.
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