There's no law against trolling.You can walk all you want.You can hear a bird and move into a better position to call.I move multiple times and reset up to call in most of the birds I kill.That's how most people hunt.You just have to call the bird in.What you can't do is see a bird,say out in a field,sneak up on it and shoot it like what was posted.That's clearly illegal and most people thankfully,do not hunt that way.It's also illegal to shoot a bird out of it's roost.Hunting is by calling only.That doesn't mean you can't employ woodsmanship and other tecniques.You just have to calll the bird in.