Maybe I just aint explaining it correctly. If you shot your bow at a perfect horizontal line of sight out at a target 40yds away how much would the arrow drop by the time it reached the target, I'm just throwing a number out there but lets say 10 inches of drop, okay now climb a tree and shoot 40 yds straight down, how much will the arrow drop ? zero because your shooting down, the arrow will fly with a perfect line of sight. You could shoot from a mile up in the air it would still fly straight with line of sight. you understand what I'm trying to say ? gravity has less affect on pulling an arrow down from line of sight when shot at a downward angle, the steeper the angle the less the arrow will drop from line of sight.