I don't know if being upset about his way ot thinking or not. Ok, he come from our world. Maybe he never read a fantasy book... but at the same time, he put in danger her life because he could not choose the correct bullet, even if the only thing he needed was "I want a bullet able to kill that wolf", or "I want a bullet able to penetrate everything". He literally asked God to obtain the power to make every bullet he want. And still, he did not select a good bullet until the very last moment. Ok, this way he can create suspance, but at the same time that is a so incorrect way of thinking, in that situation. It's as if he is not aware of his own power, even if he is the one that asked for it.