Question: At the end of the episode, where Melinda helps that lady (who meets the guy who got her dead fiance's heart), what was the man at the end of the episode (who was laughing and seemed to be a spirit) supposed to be about?
Answer: This "spirit" appears in several episodes throughout the rest of the season including the season finale. He's a "bad spirit" that is intent on keeping souls trapped on Earth. With the death of Andrea (her business partner) he wanted to make a deal with Melinda, to give him HER soul to release everyone else including Andrea to cross over.
Chosen answer: Toph had Katara use it to send a letter to her parents. It never returned.