Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-13965604-20130912213213/@comment-6207588-20130914001717

Since it was used in season 2 I kind of thought the mud represented the earth...since Peter was buried (yeah I know it was under floorboards) but most people are buried in the earth and  banshees are associated with the dead. But that's just guessing on my part.