User blog comment:Chaos11394/Any Ideas for new villians for future seasons!/@comment-69.255.188.213-20121231214835/@comment-69.255.188.213-20130101010335

that rule where the king of hell had to die for mammon to be freed was made when crowley became king of hell and since everyone obeyed crowley and was on his side that didn't happen until maybe by the end of the season the winchesters finally kills crowley they would deal with another problem and mammon would come up swipe the tablet and escape before cas even gets a chance to get him