 After getting the ingredients for a "demon bomb", Castiel gets Sam as they will need all the help they can get to rescue Samandriel and yells at Sam and Dean for their behavior.At the warehouse, Castiel tells Sam and Dean what symbols to neutralize and where so he can enter and gives Sam his sword so he has a weapon against demons.After Sam and Dean clear the way, Castiel enters, but is weakened by the other sigils in the building.