Sure, a vampire show on Halloween week is going to get some attention. A big Halloween party scene at the school is also foregone conclusion given this is a teen oriented show. So, how did this episode manage to stand out among the many other shows that have done this party scene premise? By moving along the building drama, that's how. It ended up being a party everyone sank their teeth into (I know, there I go with the vampire puns again).
This episode primarily existed to finish playing out the fall of Vicki. She was doomed from the minute Damon had a feast on her neck back in the pilot. Still, many had high hopes for her being a vampire. Early on though, this “vampire with issues” was just too unstable to carry on in the secular world. You had to admire Stefan’s attempt to try, but Vicki wasn’t going to hack it any better in this life than her previous one. Her end was inevitable.
Vicki’s fall was meant to setup anyway some intriguing directions for the other characters. First there’s Matt, whose burden of watching out for Vicki was becoming a bit too much. I’m sure her so called “disappearance” won't to do much to help with his guilt over being unable to help her. Then there’s Jeremy, who suffered huge trauma by finding out the truth. Vicki tore into his lip and in full-on vamp mode prepared for a Jeremy feast. So Jeremy either had to die or watch Elena - who jumped in to save him - be killed by Vicki. He got the lesser yet still horrible third option courtesy of Stefan’s quick staking through the heart skills. The color being drained from Vicki's body as she went lifeless was enough of a jarring visual to push over the edge Jeremy's already fragile state.
Of course Vicki's downfall didn't do much for Elena's growing angst either. This whole lying to everyone wasn’t doing her psyche much good. She especially felt guilty since she knew while a search party was out that Vicky was at the Salvatore mansion recovering from her turning into a vampire hangover. She kept up the lie though, for she knew that the truth hurts a hell of a lot worse, especially with Matt and Jeremy. Keeping up the lies can only become more of a challenge now that she knows Vicki is really dead. Or that can get easier. We’ll see which.