ive heard of this happening also. today i shot at a 6 point almost completely broadside. i didnt compensate for the loss of gravity due to shooting elevated, simply because there was no difference when i practiced at my house. well i hit very very very high. higher than the spine if its possible. i took a little chunk of hair off the top of his back, right from the shot i saw my arrow and were it went. I went to retrieve it later to just find hair. no blood at all on my arrow or broad head. i tried seeing if there was any blood by were he was going but none. i'm just glad i didn't hurt him. tomorrow while im hunting i might put in some time just to make it 100% sure i didn't wound him bad and only nicked his skin and a little hair.