Hard to tell from the fletching but if the shaft didn't have blood it would indicate a bad hit at least to me. Sometimes those really close shots are hard since it seems hard to believe you wouldn't hit it good. I always remember the trick shot that made me a few bucks at 3D shoots. Pick a bullseye at 5 ft and bet someone they can't hit it. Most will shoot inches below the target. Depending on the bow and sight the 40 yd pin will usually be close. Too bad it happened but that is hunting. I wish I could get a second chance on all the shots I blew over the years. Who knows you might even see that big guy again and get another chance. A buddy blew a chance and wounded on an 8 point and later in the year bagged it when the rifle season came. When he processed the deer he found his broadhead all covered with grizzle in the chest section of the deer. It passed through the sweet spot but somehow missed all the vitals and lodged on the opposite side in the ribs. Deer are a tough animal.