Game of Thrones 2.05 "The Ghost of Harrenhal" No Book Spoilers

[SecretaryofEvil]

In regards to the shadowbaby, it clearly has some sort of limited range/time of existence. Why else would it have been necessary for Davos to smuggle the Red Priestess behind Renly's lines?

Also, remember what the witch told Dany in season one. All magic comes with a price. The shadowbaby has already cost Stannis his sense of honor and righteousness that he feels so strongly about.