You are trying to out lie a duck hunter. Forget it there is no way. Duck hunters are as bad as golfers.
There are countless ways to shoot a duck. I've shot a duck while being dragged by a dog. I've shot one and reloaded while sliding down a hill on my back. I've shot ducks while in the water, from boats, lying on my back, lying on my stomach, sitting, crouched even standing. I've shot from the shoulder and from the hip. Duck hunting can go from boring to frantic in a heart beat. I, like most, people limit out on the first or second flight. Then unlike most people, I put the gun away and watch. I like to watch ducks, they are fun to watch. Watch their habits, their feeding cycle. You learn about ducks by watching them.