[ Strange pauses for a moment, frown still before he continues. ] Have you met Childermass? He's from my world and more specifically, from my future. He's given me every reason to believe that in his present, my future, I'm not dead. So you can see why it would be a bit inconvenient were I to die in the line of duty.

[ What Strange knows about time travel and timelines could probably fill a sheet of paper. Still, even he knows that someone dying when they're supposed to be alive = bad idea. ]