Show me where this "void", between spine and lungs, is in the picture below....



As Shaw said, the spine dips a LOT lower than most folks realize....there is no "void" between the spine and lungs to speak of, as you can see from the picture posted. I also saw a picture of a deer someone killed on Archery Talk a couple of years ago, though I can't find the thread now, where the guy's broadhead hit both the spine AND the top of the lungs. You CANNOT put an arrow in a [anatomically healthy] deer that goes between the spine and lungs without hitting one or the other (or both).