He left Blizzard suddenly when World of Warcraft: Wrath of the Lich King came out for unknown reasons. Surprised, he returned in World of Warcraft: Mists of Pandaria in Patch 5.1 and got back to work. Starting Patch 5.2, he and Glenn Stafford worked together on many pieces including the Troll music which left Derek Duke hanging in the balance of what happened to him.