A highschool teacher of mine once told a story: They hit a deer, knocking it down but not killing it. Someone else pulled up, saw the deer was still alive, and called whoever the authority is to get permission to give the deer a merciful end. After getting permission, the deer chose that moment to remember it was ok, jumped up, and ran off into the woods. The person who now had permission to hunt this deer promptly ran off into the woods after it.

Never go up to a deer you're not 100% sure is dead. They're big, hurt, and can decide any moment to flee or attack.