No Man's land is ABOVE the spine and between the vertibre. I've shot a doe here before and swore I'd hit her in the chest cavity. I later found that the doe had dropped at the shot and went thru the back straps. I trailed this deer a long ways with lots of blood which finally disappeared. I shot the doe later which varified this.

BTW, had a complete pass through on the doe and with the arrow dripping with blood was even more sure of my chest shot. (Shows how much I know)