good question! i hit a 5 point last week with a grim reaper expandable. it was a pass through shoulder shot completely broadside hitting center a little high at 15 yards . the arrow had some muscle fiber on it but no blood at all. the fletching looked brand new. i would imagine it passed through the lungs but i never found a drop of blood on the ground or on the arrow. spent 2 days looking and never found the deer. i have white cresting on my arrow and im confident i saw where the arrow hit center high of the shoulder. this is the strangest hit deer i have seen.