Bravo, you played your cards just right. There is no way Sydney could have figured out that you were a vampire hunter. After all these years, she thought her secret was safe, that you didn't know she was a vampire. But what she didn't realize was that you knew all along. And that you waited until today, your wedding day, to finally give her the secret potion to defeat her. After taking a sip of the potion, she notices something isn't quite right. And after a few moments, the irreversible process starts. She starts to melt. And melt, and melt some more, until there is nothing left of her