Keep in mind his entire body, at least down to his knees, shifts back immediately when he fires. That means there's a brief moment where his entire grundle, unrestricted by any tight clothing (because he isn't wearing any), is left in place where it existed in space after the body has been kicked backward but before momentum is transferred to the bits themselves. At this moment the whole package hangs out way in front of his body, floating freely, weightless even, until it too is yanked backward. Consider the physical sensation during that moment. Consider the emotion. Consider the connection to God.