Ahhhhhh .... someone who actually saw the thing and can explain it. It always helps. From the description I'd say Big G probably hit the nail on the head. There's no way he can determine if his blade opened prematurely and there in nicked a rock. The dummy was set up wrong for his skills.<img src=icon_smile_big.gif border=0 align=middle> Sounds like another classic example of Murhpy's Law and the Bowhunting Gods.