what color was the blood...light? dark? bubbles? particulate matter? smell? You've killed a lot of deer with a bow so I'm sure you would recognize a gut shot but it certainly doesn't sound like a double-lung hit either. Did you get a pass-thru? Did you find your arrow? If it was slightly quartered away and you shot it where you say you did it sounds like it would be a decent shot. Hmmmmm...got me.