When the Dark Portal was opened, many orc clans surged through the conquer the world of Azeroth. Some remained behind on Draenor however, and Brodog was among them. He was stationed to guard the portal on Draenor's side, engaging in games of chance with his fellow orc Gratar (and almost always winning). He was thus present to see through the portal and view the Horde's final defeat at the hands of the Alliance.
Brodog was dispatched to summon Ner'zhul, returning in time to see the link with Azeroth severed.
World of Warcraft: Beyond the Dark Portal -- Excerpt. Blizzplanet (2008-06-11). Retrieved on 2008-06-13.