Yes they can see the top half of you but your movements below the blind will be covered this will give you concealment to set your call down and ready your bow. You do not want to even try to snap shoot on a turkey once they spot your movement they will be on there way before your brain can register what is happening. They will beat you to the draw every time. What ever method you choose you cannot move when there head is in sight, they will pickup the slightest movement and their reaction is faster than you will be.