She poses as Elena)
Caroline: Elena? Flowers is helping her)
Mrs. Katherine: To a masquerade ball. [Salvatore's house]
(Caroline opens the door to Bonnie)
Caroline: Hey, come on in
Bonnie: I got Stefan's message
Stefan: Hey, you brought the grimoire, thank you
(She sees Damon and Alaric talking and she sees that there is a lot a weapon on the table)
Bonnie: What's going on? The trigger mechanism is up here. Spells that only do good. (She releases her)
(Elena is with Jeremy and Bonnie)
Elena: You guys are trying to kill her here? She's trapped)
Katherine: What the...? At the same time Elena screams. Stefan and Damon are fighting with Katherine. Damon arrives and is about to kill her but Jeremy arrives)
Jeremy: Stop! Elena: Are they? Jeremy: They're stuck in there with her
(He looks at Bonnie)
Jeremy: You were right; Katherine had a witch that linked Elena to her
Bonnie: The girl I saw, the one inside! (She puts herself between them. Sarah: Matt failed. Open your eyes! (Tyler catches his head and screams)
Caroline: Tyler? Tyler?! She has the moonstone in her hand)
Lucy: Katherine, the spell in this room has been broken, you're free to leave
Katherine: Thank god
Lucy: When I hand this over my dent to you is over
Katherine: Done
Lucy: I owe you nothing
Katherine: I said done.
Plan: A: Damon; Q: Who traps Katherine in the underground tomb? A: Bonnie; Q: Who is Lucy's cousin? A: Jeremy; Q: Who tells Stefan and Damon that every time they stake Katherine, Elena is wounded? A: Caroline; Q: Who breaks up the fight between Matt and Tyler? A: the Lockwoods' masquerade ball; Q: Where do Stefan, Damon, Bonnie, Jeremy, Alaric, and Caroline plan to kill Katherine? A: a witch; Q: What is Lucy? A: the moonstone; Q: What does Katherine need to retrieve? A: Matt; Q: Who fights Tyler under Katherine's compulsion? A: Tyler; Q: Whose eyes turn yellow? A: stabs Tyler; Q: What does Sarah do to Tyler? A: her neck; Q: What does Tyler accidentally break? A: Tyler's eyes; Q: What turns yellow when the curse is triggered? A: Elena; Q: Who is intercepted by a masked stranger? A: a spell; Q: What did Katherine have Lucy put on Elena and herself? A: a masked stranger; Q: Who intercepts Elena as she heads home? Summary: 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.