FM if it is a high lung shot it will take time for lungs to fill with blood to leave good trail when going down hill but he will hunt thicket and or water. use toilet paper to mark trail(rain will destroy it). go to last blood and LOOOOOK. Sometime they will turn leaves over while running. Also look UNDER bushes. (remember he is pushing the bushes over whill moving and the blood will be UNDER the leaves.) good luck.