Heroic Morckok

On Tuesday my guild got to work on Dragon Soul Heroic mode fights starting with Morchok. After spending most of the night figuring what really is a fun fight after the simplistic normal mode we ran into a snag. What happened was he enraged and we managed to kill his twin but wiped to Morchok at about 150k health. The end result was Morchok despawning whithout giving us loot, achievements or anything. Worse than that the instance didn't progress so we couldn't even move on to other bosses. So be forewarned.