Are you sure your brother isnt having numbness in his leg, causing extream difficluty in walking and working. I think that he should be seeing a Dr. about this and some counceling for him and his wife for the stress and emotional problems that this has brought on. I hope he gets this help before it causes any sexual disfunctions. He might want to see a lawyer also. He needs to tell him about all of this and also about the nightmairs that keep him up at night of this terrible attack that has left him unable to hunt.
Good luck to him
Rick