input: TEXT: [Salvatore's house] (Caroline is sitting on the couch. Damon gives her a glass of blood) Damon: Here Caroline: I'm still shaking (She drinks. Stefan arrives) Stefan: What happened? Damon: go ahead, tell him. You're gonna love this Caroline: I saw Katherine today Stefan: Where? Caroline: At the grill. I just stopped by to gawk and... 'cause I stuck Matt [Mystic Grill] (Caroline tells them the story. She's looking at Matt) Matt: Do you need a table? Caroline: No, I'm not staying. I just needed to use the little girls' room Damon: Skip the teen drama and get Caroline: Then I had to pretend to use the bathroom even though I didn't really have to go because I'm defies (Caroline is in the bathroom. She's washing her hands when Katherine arrives. She poses as Elena) Caroline: Elena? Katherine: Hey, I saw you with Matt, are you okay? Caroline: Yeah, you know... whatever (She rushes over Katherine. Katherine smiles) Katherine: You're good. What gave me away? Was it the hair? Or was it my clothe? Caroline: I know Elena is... I know Elena's at home Katherine: I need you to deliver a message Stefan: What was the message? Katherine: Tell Damon and Stefan that I want the moonstone or I will rip this town apart until it rains blood Damon: Tell him the rest of it Katherine: Tonight, at the masquerade ball [Salvatore's house] Stefan: She wants to do it in public. Killing Mason threw off her guard Damon: She's running scared. What she did to Jenna was desperate. She's out of tricks Stefan: We can't underestimate her. We have to play this smarter than her Caroline: Can we just give her the moonstone so she'll leave? Damon: No, Katherine's not getting dick. I'm gonna go to the masquerade ball and I'm gonna kill her, tonight Stefan: You're not gonna kill her Damon: Don't give me that goody goody crap
  SUMMARY:
output: Stefan, Damon, Bonnie, Jeremy, Alaric, and Caroline plan to kill Katherine at the Lockwoods' masquerade ball. Katherine is visited by Lucy, a witch who is to help her retrieve the moonstone. Under Katherine's compulsion, Matt fights Tyler. Caroline breaks up the fight, but Sarah, who is also compelled, stabs Tyler, and he accidentally breaks her neck. Tyler's eyes turn yellow, showing that the curse has been triggered. Stefan and Damon try to kill Katherine, but they stop when Jeremy tells them that every time they stake her, Elena is wounded. Katherine reveals that she had Lucy put a spell on Elena and herself, which linked them. Lucy, who is Bonnie's cousin, lifts the spell and incapacitates Katherine, who collapses. Damon traps Katherine in the underground tomb. As Elena heads home she is intercepted by a masked stranger.