With Damon away with Elena, will Stefan play with Katherine? This preview for "By The Light Of The Moon" makes it looks that way, doesn't it?
Added:
Caroline and Tyler prepare in this scene, which is courtesy of "By the Light of the Moon." Prepare for what? The latter's transformation.
Added:

The Vampire Diaries Season 2 Episode 11 Quotes

Elena is on a martyr tear that rivals even if you're greatest hits.

Damon

We're not gonna let you get used in some creepy sacrifice ritual.

Bonnie