(He leaves .she takes her phone and calls Nadia)
Katherine: Who do you think Stefan loves more, Damon or Elena? And, uh, ticktock. Caroline: Yes, and Tyler was right. Elena's my best friend. Enzo: You feed on vampires now. Go, Enzo! He tried to message me, but Nadia stopped him. I'm just saying that Elena and Damon's breakup is messy,and you are not messy.You're stable and sane and...
Stefan: and I'm about to spend 12 hours in a car with her alone, so whatever she's feeling I'm sure I'll be able to figure it out
[Whitmore College]
(Katherine is on the phone with Nadia)
Katherine: What's going on with Matt? It's like she's given up on Damon, and he thinks that she was trying to get me to kill him tonight
Caroline: But she would never want him dead
Stefan: Unless... Matt texted you, "help. Katherine: Whatever you're having but with a lot more salt and maybe covered in chocolate
Stefan: Coming right up
[A House]
(Damon tries to find a way to get out)
Enzo: Give it up, mate. No one has to die
Nadia: Relax. Start over. Stefan and Katherine arrive)
Damon: Elena. Then you might hurt them. There you go
(Damon finally attacks her)
Stefan: Damon, stop! Tyler: I don't want to be a part of this
(He leaves)
(Caroline follows him)
Caroline: She's just trying to get under our skin to distract us
Tyler: From what? Wes enlisted some of those singing witches and trapped us in the house
Damon: Do not come here!
Plan: A: Damon's behavior; Q: What escalates from destructive to deadly? A: Damon; Q: Who attacks Katherine? A: their last conversation; Q: What does Stefan regret about Damon? A: a relationship; Q: What does Katherine hope to spark with Stefan? A: Dr. Wes; Q: Who enlists the Travelers to set a trap to keep Enzo and Damon trapped? A: the Travelers; Q: Who does Dr. Wes enlist to set a trap to keep Enzo and Damon trapped in a house? A: Enzo; Q: Who does Damon have to feed on in order to survive? A: help; Q: What does Enzo call Stefan for? A: Matt; Q: Who tries to warn Caroline and Tyler, but Nadia compels him? A: any answers; Q: What do Caroline and Tyler not get from Nadia or Matt? A: their basement; Q: Where does Stefan take Damon after he breaks him apart? A: a dejected Caroline; Q: Who does Stefan try to comfort? A: their conversation; Q: What leads Stefan and Caroline to figure out that Katherine has taken over Elena's body? Summary: As Damon's behavior escalates from destructive to deadly, Stefan begins to regret their last conversation and decides to track Damon down and intervene. Katherine, masquerading as Elena, decides to accompany him in hopes of sparking a relationship. Dr. Wes enlists the Travelers to set a trap to keep Enzo and Damon trapped in a house until Damon has to feed on Enzo. Enzo calls Stefan for help, but Katherine picks up and decides to try and pit Stefan and Damon against each other. Matt comes back with Nadia and tries to warn Caroline and Tyler, but Nadia compels him before he can. Caroline and Tyler confront Nadia, but don't get any answers from her or Matt. Elena and Stefan find Damon and Damon attacks Katherine (in Elena's body), forcing Stefan to have to break him apart. He then takes Damon back to their basement and chains him up. Later, when Stefan tries to comfort a dejected Caroline, their conversation leads to them figuring out Katherine has taken over Elena's body.