Another reason that it's a tough shot is all the rips lined up in a row and tapering toward the front. If viewed without any meat on them it would be like a big wedge looking right at you. If you're just a little off on the angle and/or the deer turns the least little bit, it's awfully easy for the arrow to just slip along the outside of the rib cage, behind the shouder and out behind it. People will swear they ran it right through the deer when in fact all they did is slip it under the shoulder. It'll bleed like crazy for a while but will quickly clot up.