Just before shooting light the lake came alive. We had birds buzz our spread several times, and eventually all group up just across the lake.  All blue wing as far as I could tell.  Over 20 birds to begin with. We took a single about 15 min after shooting light and spooked the group across the lake. They came right to us and we were able to take 2 more. 15 minutes later around 15 came back to the same spot across the lake. A single came to our spread soon after but was not able to take it. Spooked the birds across the lake again but no luck on them flying by us the second time. Sat another hour and a half without a single bird flying over.