After Trag revived as a Forsaken he visited Sulamm and told his history. Sulamm however, didn't understand why was Trag looking from him, from what Trag answered that he wanted his life again but the shaman couldn't give that to the young tauren. Sulamm invited Trag to live with the Highmountain tribe again, as an honored warrior, and that he had to accept his fate. He also promised to try to remove a voice that Trag was hearing.
The next night Sulamm tried to remove the curse to Trag. Both of them entered into a state of trance but Ornamm, a tauren, went and throw Trag to fire leaving Sulamm in trance. However, the spell of Sulamm was a trap that didn't let Trag awaken. Sulamm's commands were what had to be done, and as he realized Trag was hearing the Lich King's voice, he said he didn't have salvation and should die.
Trag managed to awake, but the spell was passed on to Sulamm, who will never awaken from it. Trag was going to kill him but stopped, even when the Lich King was telling him to do so, he just left the shaman in the trance.