What I was taught when I was younger is that a Tom coming up hill is easier for him if he gets to the top and their is danger....he can turn around take a couple steps and take off in flight....whereas if they come down hill....obviously they have to run up hill to escape.....not saying this is gospel or truth, just what I was taught. What I am learning is set up in such a way that when they crest the hill...I can get a shot. I think being 3rd week of season that the birds are spooked, probably been called to a few times.....and they have learned to stop running to every call....again, I think some of this has to do with the temperament of the bird......hen is supposed to go them, hens are starting to nest, so I think toms are on the move more, but they are more aware then they were a few weeks ago.