[ It's a loaded question. But there's one thing that draws his attention. Fate. Tieria would never leave anything to fate. That to him is simply irresponsible. An excuse for not doing everything one can when in face with dilemma. But of course he also understands that he knows nothing of Lord Light's world to call out his choice. ]

Could the machine be completed and the diplomacy missions be carried out so that the plan to migrates your people away be done if measures was taken to stop the agents? I don't know how much time you had, but if there's hope, I will never abandon my world to it's demise without doing all I can.