Marcus had not been expecting to get the reaction from Jareth that he did. He had not, of course, been expecting the Goblin King to cower and comply, but he would not have been surprised if Jareth had laughed in his face and dismissed him. In truth, the Ranger had not been sure if he would get any reaction at all. He was so surprised that, for a moment, he forgot to stop glaring defiantly.
As he turned Jareth's words over in his mind, at first he was full of wonder at the offering. Then the pain of the choice struck him. In a way,it was a cruel choice to be given; but, ultimately, it was not Jareth who had given it. The decision about where Marcus and Tonks should go, if ever they were to leave first Mirage and then the Labyrinth, had come up between the lovers since first they joined themselves to each other. All Jareth was doing was forcing the issue. And after all, it wasn't as if Marcus would rather have the choice taken away from him.
Of course, that did not make the decision any easier. The Ranger's loyalty to the organization he had made the cornerstone of his life was as strong now as it had been the day he had been taken to Mirage, and he knew that the war that was coming in the galaxy was exactly what that organization had trained him for, exactly what he had been seeking to repay his debt to his brother and family. His love for Tonks, however, was equally as strong. He had waited his entire adult life for a woman like her, a woman to whom he could give his heart, and his body, a woman with whom he would build the rest of his life.
After a seemingly-eternal agony of deciding, Marcus knew he had made the right choice. He lowered his pike as a gesture of surrender and trust.