The_vampire_diares_2x07

Stefan and Damon decide they can no longer let Katherine terrorize the town. With the help of Bonnie, Jeremy, Caroline, and Alaric, they lure her into a trap at the Lockwood Mansion .

Elena tells Stefan that while Katherine is gone, she still doesn't feel safe and can't be with him right now. The_vampire_diares_2x07

She compels Matt to pick a fight with Tyler, intending for Tyler to kill him. Stefan and Damon decide they can no longer

Katherine reveals she has a witch of her own, Lucy Bennett (Bonnie's cousin), who has magically linked Katherine to Elena. This means any physical harm inflicted on Katherine—like being staked—is simultaneously felt by Elena. Lucy Bennett (Bonnie's cousin)