Damon and Stefan in “Unfinished Business”

Damon

Katherine’s with Mason Lockwood?

Stefan

We missed it. He got into town right after she did. It makes perfect sense.

Damon

I know, but Mason Lockwood? Werewolf thing aside, the guy’s a surfer. She’s gotta be using him. She has to be.

Stefan

Using him for what?

Damon

Mason Lockwood’s looking for a moon stone that allegedly can break the full moon werewolf curse. Maybe Katherine wants it as well.

Stefan

Why?

Damon

Well,...no idea. It’s the beauty of Katherine. She’s always up to something.