The Vampire Diaries Season 2 Episode 5 Kill or Be Killed ( Air Date 2010-10-07 ) Genre Drama, Sci-Fi & Fantasy category. Overview "Tyler learns more about the Lockwood family curse from Mason. Stefan and Damon argue over how to handle Mason. Elena tries to keep Jeremy from becoming more involved with the Lockwood mystery, but Jeremy makes an effort to hang out with Tyler. Mason gives Sheriff Lockwood some startling information, leading to a night of violence, confession and heartbreak.".