Or did the SS sniper look up to reacquire the shooter. That often helps to get back on the target due to the limited field of scopes. By the way, you will notice that the SS snipers were on a sloping roof. Thank God they didn’t roll off and cause another tragedy.
But why duck?
He's got Crooks in his sights. He's observing him.
He looks up after he hears the first shot. Ok, perhaps. But didn't he already have him sighted in? Why look up and loose sighting/timing? Is that what snipers are trained to do?
He then ducks. Why? Because he heard that shot? Or, because he heard something much closer, whizzing by his head?
He then re-engages, re-acquires (after having already acquired the shooter) and takes a shot. Ok, sure.
Doesn't his action in the middle seems out of place for a sniper? And, even before that where he looks up and away from his scope? Strange.