Euro boars don't have the temperament of the everyday feral pig. You have an animal that has been hard wired to survive and if he's your alpha herd boar then any other boars or challenges are met in battle. He should make for great breeder boar and maintained in some other enclosure so he can breed.
Hey that's why euro boar hunting with a bow is such a rush cause this very thing can and does happen. I've had it happen to me down Tenn. and once you get charged by one of these prehistoric behemoths it gives you a whole new perspective the "blue collar grizzly bear hunt".