Apparently about dismembering fractured joints.
Look, fractures are here as sort of a reward for the player getting fractured, and a lost for the player trying to dm a joint. The player getting fractured gets a disadvantage of not being able to control it directly, but doesnt have tto see it flying off out of the ring. The player attacking didnt hit hard enough to DM, so it just gets a fracture. And tell me, how many times have you been grateful when a hit in the neck didnt decap you, only fracced the joint, or infact, any other joint? Yeah, probably many.