Im thinking he is feeling bad and just want some people to tell him it is OK and it happens to us all. If you put in all the effort you could in finding the deer and you can honestly tell yourself you did everything you could, I wouldn't beat yourself up about it. Everyone looses a deer, hopefully it will be the last one you loose. You just hope that the injury isn't to severe and she can make it. Good luck on your next one, Im sure it will be a perfect shot!