It's part of the game for bowhunting in open country from the ground (like everything up here). You do what you can by paying close attention to the animal's behavior and using the terrain/cover to your advantage but sometimes you just get hung out to dry...

My brown bear caught the movement of the bow's limb above the brush as I drew on him and had me cold busted at 17 yds. I guess he just didn't think I was that much of a threat and took the step I needed after a brief stand-off. I've had deer bust me and bug out. I've had goats bust me and walk up closer to see what the Hell that funny looking rock is. You need to know your game and how they react to their surroundings.