The Halloween episode of The Vampire Diaries was full of tricks and treats — as well as an extremely depressing break-up for our beloved Forwood. But the one thing that really took us by surprise on All Hallows’ Eve? A shocking revelation between Katherine Pierce (Nina Dobrev) and Nadia (Olga Fonda).

When Nadia made up some crazy story about Katherine getting her mom killed, we were totally taken aback. And from the looks of things, so was Katherine, because the now-human wild child stabbed Nadia through the chest in the middle of a restaurant. Ew!

Later, when Nadia confronted Katherine and revealed that she was none other than the Petrova doppelganger’s long-lost daughter, our hearts melted. Olga has already revealed that it was the first time she and Nina had practiced the scene together, which is why it was so emotional and raw. We just love to devoted these stars are to making these crazy mythological twists actually seem possible.

We’re excited to see what the coming episodes have for the two of these ladies. It’s good to know that after Damon let Silas drain her blood, human Katherine seems to be up and at ‘em again.

Were you surprised about the huge twist? Hit the comments and let us know!

Carson Blackwelder is an Associate Editor at Wetpaint Entertainment. Follow him on Twitter and Google+!