Stop the game, reset your system and try again.
This sort of happened to me when I was working the the veteranarian doctor at the hotsprings. I retrieved the bag and went back to him and he started acting all funny. He jumped on an ATV and I thought for a while he was heading back to the jail (as this went along with the storyline), but when he didn't. Then I figured it was a glitch on the (PC and Ubisoft software). So I ended the game, went back to the desktop, closing Uplay, rebooted my PC and the next time I was with ths doctor, additional game prerequesites came up telling me I needed a black bear and two pronghons and the mission ended as it should have.
I guess some missions do have bugz. Happing hunting!


