The way I'm reading your posts, and please clarify if I'm wrong, is that you knew said blind was in the back of this creek, said lake was open to hunting, and that duck season was open.
You say you didn't see any ducks or geese when the shots were fired. Do you think that maybe he killed said waterfowl? Early in the morning it's really difficult to see any birds below the treetops from 50 yards much less from several hundred yards unless they are above the said treetops.
Don't take this as me condoning what happened, because if he did intentionally shoot at you that is uncalled for. My opinion is that he most likely was shooting a one or two ducks that you could not see, due to the factors listed above, and you did not see said waterfowl because they didn't make it out of there.
I know this is public land, I hunt/fish KY lake and barkley year round. You have a right to be there just as much as I do. Take into consideration during hunting seasons that there will be people hunting all over the place and the best thing you can do is give them quite a bit of room.
Here's a story that happened to me a couple years ago on KY lake in September during the early woodduck/teal season we have. Our first spot we showed up to someone beat us to it. So we move up the lake to another bay/creek and get set up in a not so ideal spot. About 7 am a bass boat comes in and starts fishing on the point we are set up on, less than 30 yards from us, and after they have idled for 50 yards and seen us waving them off from the bank.
I asked the guy in the front if he saw us waving him off, answer is yes, asked him if he knew the first day of duck season was today, answer yes, and asked him why in the hell he would come and fish a point knowing hunters are there and would he go somewhere else. His answer, he was fishing a tournament and wasn't going anywhere. He was made aware that if a duck came in it would be shot, and we couldn't guarantee which direction the shots would be headed. Ten minutes later we shot a duck and they were about 50 yards down the bank. They left right after that.
Respect goes a long way. If you show me respect you will get it right back. If you're an ass to me get ready to get it right back.
I'm going to give you an idea of what it's like in a morning for me during duck season when I hunt KY or Barkley.
Get off work on Friday and make sure everything is ready to go the next morning. Usually get in bed around 10 PM. Wake up at 3:00 AM. Leave @ 3:30 to drive a hr to the lake with a pitstop at a gas station. Arrive on the banks of KY lake around 5 AM. Proceed to put out decoys, cover/brush/set up blind, adjust decoys depending on wind, one by one (usually running 4-7 dozen). This takes between 1 hr- 1 hr 15 minutes depending on what we decide to do for the day. Begin hunting at shooting time.
There's a lot of work involved and I thought it would benefit some of you who do not hunt with some perspective on what it takes every morning for me when hunting public land.