Ruby was trying to talk to him logically. Sam didn't understand some of it, but he could process the emotions riding across her face. This was serious. Maybe even important. Sam had to, for both their sakes, attempt to hang on. To focus on being Sam-Sam, not the cross combination of whatever it was that he turned into when he didn't have a good grip on himself. It was hard making his mind work the way that it used to though - he hoped that, in spite of how bad everything was, Ruby understood that he was trying here. He didn't want to sit around acting insane. Half the time Sam wasn't even aware that he was doing it. He probably wouldn't have even known that he did it at all, if not for the fact that Lucifer constantly reminded him that he was very much out of his mind. That and, of course, the way that Ruby kept looking at him. The way that she questioned the things that he said, like who she was talking to. Who else would she have been talking to besides himself? He must have said something. Something weird. "I'm here," Sam said uncertainly. "It's just me."
Sam rubbed at his eyes. She was talking about stuff, expecting him to know how to respond to it the right way. What if he made her more upset? He didn't like this Ruby, but he didn't want her to be upset. "You should kill me," Sam told her after a long moment of consideration. "It's the only way to end it, you know. It'll save everyone. It'll protect my family." Sam reached out and grabbed at her shoulder, making physical contact with Ruby willingly for the first time since he'd seen her. "It'll set us both free. Don't you get it? I'm trapped. And you, you're - he turned you into this and I helped him and..." Sam let go of her, fingers finding his hair again. "I don't want it anymore. I shouldn't have said it, I know, I shouldn't have..." Sam curled into the door again, his body shying away from Ruby's own. "I want to go back. Can we go back? Let's go home. Let's go. Please, Ruby, can we go home?" Sam felt something warm spill down his cheek. It was warmer than the rest of his body. Warmer than the cold. Tears. He didn't even know he had those anymore. As it turned out, Sam had been wrong.
"He's not done yet. Still has work to do. Don't give up yet, Champ. You were made for this. You're his favorite, remember?" Sam laughed nervously. "Didn't stay dead. Shoulda stayed dead." He closed his eyes, breathing in deeply as another tear slid down his cheek. "I'll get you fries, too, and we can go home and be ourselves again, okay? No more apocalypse. Dean doesn't have to die. You can be Ruby again and I can be Sam and everyone will be okay. I won't say it again. I promise, I won't."