For whitetails, light rattling can work during early season. Last Saturday, I saw a decent buck at about 250 yards. He was poking along, browsing. I rattled, and he lifted his head. I rattled lightly again, and he broke into a trot and closed the distance. Unfortunately, it was right at the end of shooting light. And we have had other experiences like this with the whitetails during early muzzleloader. So yes, it is possible for them to come and see who is sparring.