Ill Met By Moonlight speedrun
I found out about this glitch to easily speed run this quest. I don't know if anyone else found out about this but here's what to do. So when you start the quest and talk to the person (I can't remember his name) in the Falkreath Jail, he gives you the ring and then tries to escape. But before he gets out, make sure you have a good spell or shout ready to kill him. I used Fire Breath, the fire goes through the bars. Then once he's dead, go to his body and skin him by using the plate technique or tcl in the console. Then, Hircine talks to you and tells you good work hunter and the quest is completed. Also, he gives you the armor not the ring. So basically you don't have to go to the cave and do all that crap to finish the quest. However the kill the great beast objective is counted as uncompleted, not failed in your journal, but the quest still completes 100%. I hope this helps.