To me its one of them things that you just don't believe till you see it for yourself, I have not seen it yet! The only thing I can think is maybe there is a chance that a deer could have fully exhaled right at the time of impact and maybe the arrow skirted the vary top of the cage and just nicked the lung. It could happen but I think it has to be a perfect chance thing. I have been cutting up my own deer and there is not any meat below the spine. The ribs hook right on to the spine disk and theback straps sit on top of the ribs on each side of the spine. the spinal cord is alot lower in the back then most think and some times I think some guys put a arrow right through the back straps and never hit the spin and assume they shot below it. Some think the spin is just below the skin like on us and other animals. So there is not much room below the spine IMO and I cant just see this small pocket of fluid or air between the ribs and spine. Deer would have to fully exhale and thearrow would have to skirt the perfect shot just below the spine and then only nick the lung.