Unfortunately, the 4th season of this show has mostly defects to show us until now. Unbelievably slow story pace and ridiculously convenient writing (from the Cure being introduced just after Elena was turned accidentally to killing an Original without knowing for sure that Klaus is the Original from who they descend).
Who was the recent victim of the fact that the writers see us as stupid amoebas? One of the Originals, Kol (oh, and Stefan who turns the engine of his motorcycle on to prevent Klaus from hearing that Elena is planning to kill his brother!)! Let's see what happened with Mr. Kol, shall we?
First, Kol appears to Bonnie to kill her but he starts chatting with her and Bonnie now has enough time to fight back. What we got? Bonnie-Kol 1-0.
Then, Kol arrives at Elena's place. He gets an invitation and starts chatting with Elena. At the same time, Elena's friends are looking for a dagger or the White Oak Stake to neutralize Kol. In the meantime, Bonnie is leaving Jeremy and Elena at Kol's mercy to spend some "quality time" (fighting) with her parents! Then, Kol leaves Elena's house but comes back to tell her that he doesn't believe that our beloved team is going to stop looking for the cure and is getting ready to kill Jeremy. After some ridiculous looking and fighting (like he couldn't scan the house in one sec with super speed), Kol finally wounds Jeremy and stakes Elena at his stomach (although 2 minutes ago he informed Klaus that the stake will be in Elena's heart, something that would 100% prevent the team to look for the cure, since our little girl would now be dead for real and there would be nothing left to cure!). Now, he is on Jeremy and prepares to chop his arms. And look what he does! Instead of simply ripping them off in front of the staked Elena, like Elijah is doing with hearts, he gets Jeremy to the kitchen, ties him up and chooses a good cleaver!!!!!!! Then, he starts chatting with Jeremy once again, giving Elena more than enough time to unstake her stomach and come for the rescue! But how a 2 week old vampire can overpower a millennium old original vampire? It can't! It's impossible! But dear, beloved Elena is something much more powerful than an Original! She is the protagonist of the show and that means she can break all the show's rules if she feels like it! So, she rushes in the kitchen and pokes Kol. Kol was about to cut Jeremy's arm with the cleaver but thanks to Elena (big surprise!) the cleaver cuts one of the ropes that hold Jeremy! Then, god Elena (stronger than an Original) keeps Kol immobilized at the sink for more than 10 seconds, giving Jeremy enough time to untie himself who starts spraying Kol with vervain, as Elena finally free the poor Original! And now? Now, Kol could just use his super speed and flee. But no. He sits there, screaming because some vervain is burning his skin (a burn that heals in seconds if we remember Elijah's first appearance). Then, god Elena grabs him (although he is sprayed with vervain), gets the White Oak Stake out of his pocket (Kol does once again nothing to stop her). God Elena gives the stake to Jeremy and he is staking Kol at his heart!
I have nothing else to say about this episode! This mess will need serious time and SERIOUS writers to be fixed!