So much happened in this episode! Kevin's death just before one month break makes the viewers to consider why the show is so generous to spend one of the main characters of the last 2 seasons. On the other hand Crowley has a very critical role in this episode as saving Sam from Gadreel. Human blood seems to be changing Crowley in a way that the viewers desired. However I've mostly enjoyed the parts where Dean, Castiel and Crowley hang out. Sam could be in the shadows in the next episodes for a while because the synergy that the three of them caught was awesome! This show had peaks and bottoms in the past however the content of this episode was so satisfying and probably that is why this is a candidate for the top!