This one actually surprised Krista, and all of us, really, because no one thought they'd pull off their plan to kill Kol! That's two Original vampires our gang has managed to kill, in two of the only plots they've concocted to actually go as planned. Plus, they've got Klaus trapped, and Jeremy's tattoo map complete, so seemingly all of the pieces together to get the cure. As Damon says in the episode: here we go!