Also, if it makes any difference, I used a lightning spell to kill him while he was stuck in his cell. Is there a way to actually get in the cell? Maybe looting his body or something would register it.
edit: Does anyone know the id for Hircine's Ring to just get it through a console command?
edit 2: The quest definetly bugged out. Sinding didn't break out of jail, and he's stuck in his werewolf form in the cell.
edit 3: http://steamcommunity.com/profiles/76561198014353473/screenshot/596954040444083366.. I'm not sure how another one got in there.