Eventually, the growing tension in the Winchester family hits a breaking point. Everything falls apart. The only thing that comforts Liz is that she knows that they won't stay broken like this forever.
Even though it certainly feels like forever.
Sammy wants to go to college. Max doesn't take a part in the argument, since he knows John could care less for him, but it's fairly clear that he wants the normal life.
John blames him for Sammy's decision, and that's where Liz steps in. She releases all her pent-up frustration at John, at the way he treats them, at how he continues to let his need for revenge pollute the rest of their family.
Dean and Sammy are shocked at the way she feels towards John. Max isn't—he can see the similarities between John and his own father, and though John at least cares, it doesn't excuse his treatment of his kids.
Dean puts his own two cents in, then, accusing her of manipulating Sammy into wanting this. She doesn't deny it.
John tells Sammy if he leaves, he shouldn't come back. Max follows him as he walks out the door, only pausing to look at her for a second. She gives him a small smile, and he nods, his back straightening as the door closes behind him.
She leaves then, after meeting John's eyes for just a second. It's enough to see that though he's hurt, he meant what he said—at least, when he said it. There's a hint of regret.
She doesn't say anything, just walks out the door. Sammy and Max are long gone, likely in the car she bought personally for Sammy's birthday. She'd offered Max one too, but he and Sammy had agreed that it was a waste of money and just decided to share.
She hears footsteps behind her. She recognizes the pattern. Dean.
"Dean."
"Why'd you do it?" He says. His voice is confused, hurt, lost. "Why'd you say those things to Dad?"
"Because they're true," she says, her voice completely calm.
"He tries!" Dean defends, but the look on his face says that he knows the argument is a lost cause.
His voice is small when he speaks again, not at all normal for her cocky little brother. His usual bravado is nowhere to be seen.
"Are you gonna leave, too?"
She meets his eyes. "I don't think I can be near John right now. Don't think he wants me around either."
Dean winces at her calling him 'John' instead of 'Dad'.
"Where are you going?" He asks, not arguing the topic.
She grins, then, and then she says, "Well, there aren't just hunts and monsters in America, you know. I've always wanted to see Mt. Fuji."
Dean's eyes widen. "You're joking."
"Nope. Four year global road trip for me."
He looks like he just got slapped in the face. "Four years? You're gonna leave us for four years?!"
She winces and then says, "So's Sammy and Max."
"They'll still be in the country!"
"You're still afraid of flying?" Dean flinches and turns away.
"Fine. Whatever. Just go."
"Dean," Liz says, but he interrupts her.
"Just go!"
She turns and walks to her car, giving him one last glances before she opens the door and slides into the driver's seat. Their eyes meet through the glass of the window, dark green and dark blue.
He turns and walks back into their room, and that is the last Liz will see of him for a long time.