The two ethereal soldiers who were fighting Thelgrun were level 60 and level 65 special elites. They were not a problem for the president. Still, it took time to defeat them considering they were natives with high HP.
Viking had better progress. He used Berserk and went all out. He managed to reduce GraphicZ's HP to critical, but the battle became more difficult because GraphicZ activated Last Stand. Under Last Stand, GraphicZ's defenses greatly increased and all the damage he received was halved. Avenging orbs were also produced even when GraphicZ didn't suffer any hits.
Viking was frustrated by the slow progress but he kept his calm. As the leader of his team, he had the experience of dealing with many frustrating situations. He wouldn't have lasted this long as a leader if he lost his cool just because the opponent didn't lose as quickly as he wanted.