CP -Move him on !! Once the new owner has taken him you have no responsibility for what happens PROVIDED you are honest and open about his behaviour. If you give him to a new owner who corrects him and sells him for $50,000 it is not your problem. If the new owner shoots him it is not your problem. You need to move this horse on - First give him a chance of a new home but if nobody will take him then put him down. Remember you are not experienced enough to judge what another person could do with the horse. You cannot knowingly give him to somebody that "Any reasonable person" could reasonably expect to be hurt by the horse.