Because Really

Bonnie watched as the familiar woman gave Katherine the stone, which caused her to pass out. She stepped back and apologized for her involvement, and Bonnie stared at Katherine. This woman who had been making their lives miserable. The woman who turned Caroline into a vampire. The woman who lied to Mason and made him believe that she cared, only so she could get the stone. Sure, Bonnie played a hand in his death, and it was Damon who actually killed him. But still, Katherine signed his kill order the moment she recruited him.

Damon and Stefan were talking about where to take her, but Bonnie wasn't listening. She picked up the stake and just stared. Next thing anyone knew, Katherine had a stake in her heart and she was turning gray, and then eventually to ash.

"What the hell did you do that for, witch?!" Damon was pissed.

"Bonnie!" Stefan was astounded.

The woman turned, "Nice job, Bennett. You just might survive this hellhole after all."

"Why did I know I could trust you? Why do you feel so familiar?"

"I'm your cousin. Sheila Bennett was my aunt."

"Really?" She wanted to hold on to this woman for forever and never let her go. "What's your name?"

"Lucy. Lucy Bennett. Hey, stay safe cuz."

"You aren't staying?"

"No. Not right now. You made me realize that I need to stay out of vampire business."

"What about me?!"

"You are one of the good ones. The middle is where you belong. And if you play it smart like you did just then, by killing Katherine, then you just might survive. Don't worry, I'll be back soon. I promise."

She walked away and Bonnie felt more alone than ever.

"Hey! Earth to Judgy! That was a nice bonding moment, but what the hell?!"

"I'd hate to agree with Damon, but I do. We agreed to put her in the tomb until she talked." Stefan was shocked and confused about what Bonnie had just done.

"Here's the thing. You guys agreed, not me. Katherine had been alive for hundreds of years, managed to talk her way out of the tomb the first time, and was a threat. I'm sorry, but any information that she might have had wouldn't have outweighed the danger she posed to my friends and I. So yeah, I sent a stake right through her heart. I'd do it again. I can bet it will save us a lot of trouble in the long run, but even if it doesn't…" Bonnie shrugged, "Oh well! That bitch needed to be gone."

Damon was looking at Bonnie in a new light. Sure, it would have been nice to leave Katherine in the tomb for a hundred plus years, before he opened it and finally killed her. But Bonnie was right. She needed to die. He picked up the moonstone and nodded, "You're right. She did need to die. Whatever she knew, we can find out."

They were walking out of Tyler's house, towards Bonnie's car. Elena was already standing by it, "Hey, Bon. Some woman named Lucy told me to give this to you." She held out a leather bound journal.

Bonnie untied the string and opened it. As she flicked through the pages she started to smile, "It might not be so hard to figure out what she was doing, after all."

Inside, there were pages and pages of notes on the moonstone, some sun and moon curse, and the original vampire family. Stefan and Elena hugged Bonnie, and Damon smirked. Things were looking up.

****END****

This is mostly because I never understood why they didn't kill her in the first place. Don't get me wrong, I actually really liked Katherine as a villain and as a snarky character… But still, why didn't they kill her when they had the chance? That was the entire point of that night, so why suddenly change their minds and put her in the tomb? It was dumb.