World building is kind of shit. Now that he's retired, there's no reason he can't get better looking prosthetics. The bandits are clearly familiar with space-faring civilization so why are they stuck using clubs and kinetic weapons? They thought that would be enough to attack someone with a laser rifle and drones? Even in current day, if someone threatens you with a drone and you have a rifle in your hand, you're already fucked. I'll just assume that both the bandits and this abhuman nun are from the same community of people abandoned by the corporations that terraformed everything. Otherwise how can you explain how poorly equipped they were?