that is the most complicated explanation for shooting uphill and down I have ever tried to read. The reason most people miss is because of misjudged distance. if a deer is down hill at 400 yards that dont mean you aim at 400. Leave him at the same distance but bring him straight up to your eye level and thats the distance you aim. He may be 400 yards down hill but actually only be a hundred yards out. shoot for what he would be if you brought him up to eye level.