I find going in as a dps with the trust feels pretty fast. You can run ahead and pull the extra mobs and as soon as you're close to Thancred he will grab them off you. If you get too far away the trust npcs will also teleport to you which is helpful although at times Thancred will immediately try to run back to any mobs he was fighting. But for the most part you can pull wall to wall and aoe things down with your dps and it goes pretty quick. I think the only dungeon Thancred ever died for me pulling wall to wall was Mt. Gulg.