First of all it's one hella of an episode, in this episode the winchester brothers are entrusted with the task of exorcising a witch who would raise samhain the patron of Halloween, upon who's arrival another seal shall be broken before Lucifer walks free. This episode is kinda different as it sets a tone for the things to come. Sam and Dean begin the investigation in their usual FBI manner to determine the death of a man who dies trying to eat a chocolate as he vomits blades from his mouth, later another girl is stuck in a small tub and is boiled to death while trying to pick an apple from that bucket. Later sam and dean follow the tracks of the witch to kill her and find out the witch is not a girl but a teacher.
The angels are sent to test how strong of a person is dean, is he good enough to lead the war against the evil that shall be a scourge the face of humanity. It clearly shows how much of a determined person is a dean who shall not care for himself to protect the lives of the innocent. Dean is fearless when talking to the other angel Uriel, when he asks Uriel to burn down the village with him. Dean call the angels are like hammer no questions asked just do the job. Sam is very excited to meet them but after talking to them he can't figure out why would god send angels to burn a whole village just to kill one witch. Finally sam uses his abilities to kill samhain once he is brought back on the surface, while dean watches. In the end dean talks to Castiel about his actions as how he failed and he says given a chance to choose again he would do the same thing again and again and Uriel talk to sam asking him to ask dean what happened to dean back in hell.
Overall it was a great episode and as always dean and sam rock when it comes to killing demons and sending their sorry a** back to hell.