After seeing the photo, I gotta agree with Chuck. To even think this was a 50 inch deer would be pushing it. My first thought is how many deer has this guy taken prior to this one. Maybe he loses control at the sight of antlers, some guys do. I'd sit down and have a long talk with him and make sure he understands that you are dedicated to the management of your herd. If I had an antler minimum I'd make sure he understood it. If it was 135-145 inch deer I'd not think much of the situation. I've hunted deer for quite a while and would still not be able to tell a 135 over a 150 many times in hunting situations.