This is only my second year of bowhunting but I do believe there is a dead spot above the lungs and below the spine. My dad hit it once and by the sounds of it his hunt was just like yours. The same thing happened to me last year and it would have been my first deer but It never went down. We tracked it about 300 yards and it stopped bleeding. So we just followed the tracks because it was really muddy and found out she eventually slowed down and came back to my stand after we left to track her![:@]