it is definately not cool to shoot a dike at passing birds in my opinion unless they are REALLY low and there is no one else hunting with decoys within about a mile. I can not stand guys that shoot at birds from the dike as they are working towards my spread. in some cases guys will fire shots at you if you do that. I personally do not blame them because they went to all the trouble to get the field and pack in the dekes and set them and do it right just to have someone shoot at birds that are working their spread. but once again it is just my opinion. I would say if you are going to shoot the dike just make sure no one is hunting anywhere near you and dont take any shots over 30 yds high or it is considered sky busting in my book.