SUGGESTION - GO FIND HIM ! If you have that much blood in a pool, AND a chunk of him, and a bloody arrow, you had to have hit him pretty solid. If you would have only popped his shoulder joint there would not be that much blood if Im undersatanding you right. As said above - get a Coleman lantern and go look with a buddie or two... Hes probobly not far.....

Good luck and be positive...