I suspect it was another deer blowing, they will bleed out long before 30 minutes on a double lung hit. The buck I double lunged with my crossbow went about 60 yards and piled up in a creek. I took my time, grabbed my back pack and got out of the stand found the blood trail and quietly and slowly followed it to the deer till I saw the deer in the creek dead. From the time I started tracking till I found him was about 15 minutes. He went that distance because he was hauling butt after he was hit.