Lockwood mansion: Jeremy tells Tyler he learned about the werelife from an ancestor's diary. He thought it too great a coincidence that Matt was attacked by a wolf under a full moon just as Mason returned to town. Tyler confirms that Mason is of the wolf persuasion but insists he himself is not. Tyler tells him about how the curse is triggered, then shows him the moonstone Mason seeks.
Elsewhere, Liz, Mason, and the gang carry the brothers into an underground cellar. Liz tells Mason he must go. She plans on killing the brothers, and since she's in her council -- not lawful -- capacity, he shouldn't be privy to it. He warns her not to take any chances and leaves as she points her gun down at the guys.
Outside, Elena watches as Caroline tries to track the boys using their blood. Mason interrupts the sleuthing and lets them know that he is aware of Caroline's transformation and will be more than happy to update Liz. Caroline lunges at him, so he quickly grabs Elena to block her. Awesomely, Caroline's all, "I can take you." And then she does. Oh, how she does. She spares his life, but surely not his ego, then tells Elena to get going.
Back in the cellar, Liz shoots Damon in the leg and demands for information. He remains relatively stoic, so she promises to drag out the process painfully if he doesn't fess up. He says pathetically, "But you're my friend!" She says their friendship was a lie and promises to kill him more quickly if he comes clean. Above ground, Caroline tunes in to hear her mother say, "He's not going to tell us anything. Kill them both." She cups her mouth in horror and tells Elena what's happening. Elena rushes to stop it, but Caroline fears exposing herself to her mother. Back inside, the council hears the door open. Elena reveals herself and says she won't let Liz kill the Salvatores. Before anyone can say another word, Caroline is running around in a blonde whirlwind, knocking bitches out left and right. She walks, mouth covered in blood, into the light and says in her baby doll voice, "Hi mom."