Outside, Mauser continues to try to find Chuck in the trees. Someone covers Chuck's mouth with a hand. It's Sarah. Chuck turns and tells her that Ned and Mauser are Fulcrum, and it's all a set-up. He says this really loud, too, broadcasting for Mauser apparently. Sarah whispers that she knows. She says the team is moving in on the people at the Buy More. She tells him to run as fast as he can to OOSSL. He says he can't leave her with this guy, but she says his safety is more important than hers and that he has to run and not turn back. He starts to run as Sarah searches the tree lot for Mauser. And a really cool, chanty version of "Silent Night" is playing, and it's all foggy and dark, which makes this scene even better. Chuck runs to the edge of the lot, but then stops and goes back in. He can't bring himself to leave Sarah. Mauser and Sarah find each other and start fighting, punching each other. He knocks her down and starts kicking her, but she pulls him down too. He chokes her. It's very unsettling how much she's losing. But then she throws him, and gets the gun pointed at him.
He tells her she might have won, but Fulcrum wins the big prize because he knows Chuck's the Intersect. Sarah says Chuck's secret is safe because Mauser's going to a CIA facility and will never be seen again. Mauser keeps taunting her, saying to go ahead and arrest him, but that he's not like the other Fulcrum agents, that Fulcrum will do whatever it takes to find him. And when they do, every agent will know about Chuck, which will be the end of his "pathetic existence." Just then, Chuck comes up behind a tree and starts watching. All he sees is Mauser with his hands up, giving in, and Sarah with a pointed gun. Mauser says, "Take me in, Agent Walker. I'm ready to go." She looks torn, and teary-eyed, and scared. Of losing Chuck. And of doing something that she knows is wrong to keep him safe. Because, remember, she promised never to let anyone hurt him. She lowers her gun and continues to look sad and uncertain. But then her face sets with certainty, she raises the gun back up, and shoots him dead. It's touching and poignant and makes her a total bad-ass and a hero. But all Chuck saw was her shooting a guy who had completely given up. He can't believe what he saw. The camera follows Sarah's gun to the charm bracelet. And then it's back on poor Chuck's shocked face.
At the Buy More, "Jingle Bell Rock" is playing again as everyone is kissing under mistletoe. Then Big Al comes in, and we get opera music building to a crescendo as he and Big Mike run toward each other and hug. They catch up a little bit, and then they plan to go eat.