A man has been arrested and charged after a violent attack on a "good Samaritan" in Queenstown in March.
But the alleged victim will also be charged after police established the attack was not random and he knew the accused.
In March police appealed for information about the attack, saying a Good Samaritan suffered a fractured jaw after an assault and robbery at the Eastburn Rd layby on the Queenstown side of the Crown Range.
They said a man signalled for help using a cellphone torch, claiming something was wrong with his vehicle.