Like you say, not always easy, even when not shooting directly toward the ducks. Nothing says a pellet is going to come out of a critter on the same line it went in !!!!
One Saturday morning at Robinson's duck farm, four other shooters showed up. Their first time there, for safety we agreed each party would stay at oposite ends of the property so that we always had several duck houses seperating us. Didn't take long before their end of the farm sounded like a war zone and we'd occationally be "rained on" by pellets !!!
After the shooting died down from the other end of the place, the owner came by and he was mad. We asked why. He said he just told the four of them to get out and never come back. One of the shooters saw a Black bird going by, brought his 12 ga up and started swinging on the bird. He got so fixated on nailing that bird that he didn't realize the bird was swooping down toward the ground to land near a feeder. He fired just as it passed in front of a group of ducks. The Black bird kept going and four ducks rolled over dead.
Paul.