i'm new to the forums, so i'm a bit late on this, but i had to write because of a vaery similar situation. in 2000, i arrowed a brute of a buck - figured to be 140-150" 8pt at last light in early november. he was only 15 yards away and the shot looked beautiful. the arrow was covered in bright red blood, looked like the perfect double-lunger. i got the tracking crew together and we began following a very heavy blood trail. we were excited, laughing, joking, and admitedly celebrating (quielty) as we followed the one foot wide bllod trail through pines. when it started to seem like we had gone a lot further than i anticipated, i got worried. then the blood slowed and the buck changed directions. moments later, it opened wide up and we came to an area a little less than 15x15 feet wide where you couldn't put your hand on the ground without sticking it in blood. everyone was excited again and i turned and said, "lets leave." my request was met with comments that the beast was just ahead and we would have him soon. against my judgement, we took up the trail. it was still great, then good, then ok, then marginal, then difficult, then nearly non-existent. we marked the spot and came back the next day. we found only two more drops of blood, each spread out about 80 yards from the last. we got a dog in there as well, but came up with nothing. jsut two years ago, i shot a doe at 10 yards facing me (i've practiced the shot thoroughly). i missed the heart by about two inches and got one lung. that doe easily went 150 yards leaving a constant two foot wide SOLID blood trail before she died. so... the only thing i can believe at this point, is i simply only hit one lung on that buck. he died somewhere, and it's a terrible shame i know, but no one intends to shoot a deer and have that happen. that's my experience with one-lungers. maybe you hit exactly where you thought, but only caught one lung, especially if you say the shot was low in the lungs. that's my theory.