sam,dean and cas go to rescue the profit.when they find him ,they break in and cas goes full angel.he breaks the tablet and crowley gets away with half.at the end cas is brought to heven while he's talking to sam and dean.an angel tells cas to stay with sam and dean.she tells him that he will be brought to heaven every so often to make reports on sam and dean.she also tells him that they brought him back from pergatory,at the cost of many angels.cas is returned where sam and dean are but they are unaware of cas ever leaving and cas doesn't tell them about it.
i don't know if this will help you or not.