Quinlan Vos is 10 times better duelist than Starkiller. Quinlan Vos overwhelms Starkiller in a fast lightsaber duel, wide and fast swinging. Starkiller screams often to present his rage and dark side affinity. Then Starkiller, when he is losing, he is using the Force. He is much better Force user. Quinlan Vos defense fails because Starkiller is so hard in Force usage (he is much stronger than Vader and maybe more than Kyp Durron and more others). Quinlan Vos screams in terrible pain from Lightning his saber useless because of Lightning too strong. Starkiller grips his head hard with Lightning and screams like animal to let go of his excitement and emotions, shaking with excitement from the power. He screams even more when Quinlan Vos dies in agony after Starkiller impales him in the chest. He stabs him 10 times again in a blind rage and screams more when burned body goes down.