If God uses both people who are formally known as teachers, and people who come to kill you - then how can one know whom to surrender to?
Well, we are assuming God wants you to surrender. And then God could be sending you challenges. To tone down the examples - God sends you a real jerk. You could conceive of surrendering as letting the jerk treat you poorly. Or you could conceive of surrendering as surrendering to dignity and not let the jerk treat you poorly. God sends a wave when I am at the beach does not mean I have to stay on the bottom since the wave pushed me there.
If you don't surrender to the teacher - you're acting against God's will. I suppose this one is understandable enough.
If God likes every single teacher and thinks they are all appropriate teachers for us.
If you don't surrender to an angry Muslim who wants to kill you - are you acting against God's will as well?
If so, isn't it about time to go against such a God? I mean, what is the danger if we have an insane deity? We're f-----ed no matter what then.
If a teacher wants to teach you, you're supposed to listen and learn.
And if an angry Muslism wants to kill you - you're supposed to let him kill you?
Surrender takes you out of the equation. The angry Muslim is still in the equation. This person is taken as part of God's plan. His or her reactions and actions. But for some reason you assume that you must take you out of the equation. Why? Why are you a cipher if the Muslim is not?
If the Muslim can surrender to his own rage and impulses and be a part of God's plan, why can you not surrender to your urge to run away from said Muslim? Or hit him? Or wave for the police to stop him?
Why am I zero, outside, not part of the plan, to be annulled, and others are part of the plan?
(note, I don't believe in the surrender metaphor, but even within that metaphor, which I think has done a lot of damage, there is a lot more swing room than I think the above implies. On the other hand I think it works as a great critique of the surrender metaphor, which is part of why I laughed when I first read it.)