I can't fault anyone for shooting a merganser, I've done it once just to see if they were as bad as everyone says the are for tablefare, and it was worse in my opinion. But if someone is going to shoot them out of dislike for the species make the effort to put them down. I'm thinking the wood duck in the grass was just forgotten, but I was only a 2-300 yards from the launch, so no excuse not to go back out and get it when they left. The one near the blind though was right in the open where you would likely set decoys, maybe it was crippled and swam over there after the guy left, or maybe he left it there. I don't know but I hate to see a perfectly fine bird wasted like that.