In all my years of hunting I have never attempted a spine shot, nor accidentally hit the spine. I know some that have during archery, and that was a mess. (Deer spinning in circles under stand dragging it's hind end. All while not presenting a shot for several minutes). Boiler room shots for me, with trying to miss shoulders and guts if quartering. I got close one year during archery. Broadhead had 2 blades cut through the artery under the spine, and the other take the top of a lung. That deer went 200yds like that.