I don't know if a metal coffee can with corn in it is illegal or not. If it's legal, more power to him. Aside from the corn, I thought what he said about letting birds relax a bit makes sense. I've hunted on clubs that had pen raised or pen kept birds. None of the birds walked up to me and they did their damdest to sneak around me and the dog so they didn't have to flush. I used to hunt the fields away from the crowds also. Not as many birds but a lot of fun watching the dog work them. And those fields were usually productive too.