We've all seen enough movies to know that we (generally) don’t get shown something for no reason. This is the opening… that alone suggests something striking is bound to happen soon. It’s how movies are. Then add in this instance cacophony, speed, smoke, great iron things near frail humans... all spelling out something imminent… and it's going to be powerful and unpleasant. You could open a movie with someone hanging washing out on a line and the viewer would be excepting something terrible, certainly striking, to happen any second. I would.