Ihave got 2 book bucks on the wall from straight down shots. Neither buck went more than 20 yds. I watched both of them fall and expire within 5 minutes. I got lung and heart on both of them. I'm not saying you should take this shot but just giving another side. I think you made a fatal shot on your deer. The meat is long gone so after season get some friends and see if you can come up with the rack.