WTF, if they wanted the monster materials, why the fudge couldn't they just take and sell it? The guy was out for who knows how long, along with it only being one person. What would/could he do? Complain? To who? Who would believe one person killed the hobgoblin? Even then, they could just say it's medical fees or something.
Also, it's laughable that they'd try to kill someone that could take down a hobgoblin alone, even if he's injured; better to try to get him to join the village, imo, so you can hunt for more.