Lydia's never been affected by mountain ash (she dipped her hand in her grandmother's urn full of it, after all). I've always chalked this up to some nuances between different supernatural beings in the show's mythology, which it plays kind of fast and loose with.

While Fiona was taking pills and Nan was running around with the witch hunter afoot, I was really hoping that Nan would get shot and Fiona would spring back to full health. Surprise! Nan really was the supreme. But no…

This episode had all the twists but not enough of the crazy that I look for in TVD. However, I did appreciate Rebekah's observation about just how much havoc Elena has wreaked on HER life and how similar the actions of our protagonists and the Originals really are.