Board Thread:Speculation House/@comment-207.165.59.250-20171107194307/@comment-26397825-20171108114007

There's also the fact that in one of the many sequels, Dorothy ends up being contacted by Princess Ozma through a mirror and has to make her way back to Oz to free her from her imprisonment. Ozpin first contacted Oscar when Oscar was looking in a mirror, and one could say that by completing the quest and defeating Salem, Oscar will free Ozpin from his curse.