Changes

Sam and Dean use the same spell they used to transport themselves into Hell while Castiel and Jack keep an eye on the spell bowl. When Castiel decides to send himself to the brink of death to find and consult with [[Ruby]] in [[the Empty]], he leaves Jack to feed the spell bowl until Sam and Dean return from Hell. While Castiel and Jack talk, one of the spellbooks can be seen lying on the desk next to the bowl and the ingredients.