Back to the Brotherhood. Gendry is fixing Beric's armor because he's decided to stay with them. Arya is outraged, because this is not a safe place to hide out. The Lannisters, she insists, will find this place and kill him! Gendry points out that the Lannisters were trying to kill him already. And the Brotherhood needs good men. Arya protests that Robb also needs good men, but Gendry is sick of serving people. He feels that Beric is the leader of brothers, so it doesn't quite count as serving him. He says, "I never had a family." Arya pleads, "I can be your family." He answers, "You wouldn't be my family. You'd be my lady." I'm not sure what point he's making here, but it gets Arya to leave. So Gendry is staying here while Arya gets taken away. Arya's sidekicks are doing pretty well at staying alive so far!
The two Lannister boy hostages are sleeping when there's a commotion outside. Men burst into the room and stab the guard. One of the Lannisters asks, "Is this a rescue?" Good question! The shout of "Lannister filth!" makes me think that it isn't. Also the way one of the kids gets stabbed. Now I don't feel too bad that I didn't bother learning their names.
So now they're both dead. Someone brought the two bodies and laid them out for Robb to look at. Robb and Talisa look stern. So does Catelyn. Robb commands, "Bring them in." It's Lord Richard Karstark and a bunch of other men. Robb says, "It took five of you to murder two unarmed squires." Karstark feels that being a Lannister means he gets to kill you. Robb thinks he can shame them by telling Karstark to look at the dead children. It doesn't work like that, because Karstark can redirect the conversation to what he thinks is the real issue: Catelyn letting Jaime Lannister go. In his opinion, freeing a Lannister is treason, while killing them is just standard war-as-usual. And he appears to be losing respect for Robb, since he tells his guards, "Leave me to the king. He wants to give me a scolding before he sets me free. That's how he deals with treason, our King in the North. Or should I call him The King Who Lost the North?" Well, now Robb has to do something, so he tells the guards, "Escort Lord Karstark to the dungeon. Hang the rest." One of them protests that he only watched, so he gets hanged last. So he can watch the others die, get it? Robb sure zinged that guy pretty good, huh? I bet he'll be pretty chagrined during those extra five minutes he's alive.
With that out of the way, Robb goes to his war table. That's what I'm calling the table where he's got his little wooden soldiers set up. Talisa looks concerned. An advisor says they can't let word get out about the Lannister kids dying, since the Lannisters pay their debts. Robb says Karstark has to die, because he's trying to be a good and just king. Catelyn says the Karstarks will abandon them. Talisa says more boys will die until the war is over, so she's in favor of trying to keep the Karstarks around so they're a more effective army, even if it means these two particular kids go unmourned. Everyone recommends keeping Karstark as a hostage to force his family to keep good behavior, which is an overused idea. And it never works. Did the Lannisters keep "good behavior" when Robb had Jaime? Does Robb keep "good behavior" just because the Lannisters have Sansa? Don't be silly. Robb thinks about his options.