I've set-up on birds still in the roost and many times had them fly right in take a couple steps and a client lets a round fly... I see nothing wrong with this because the birds were called in... They may have flown in off the roost but they still came to call. I do agree that if someone sneeks/slithers to a roosted bird and waits for it to fly off then shoot or simply ambushes the gobbler to me that is not hunting!!!The calling in what is the fun.... but how many people set up close to the roost trees and nail em as they land coming down from them. Isn't that just as bad as shooting them in the roost?