OK, in one story, I have a bunch of kids with a form of mind control that only works on supernatural creatures such as vampires. Most of them start hunting vampires around 5-6 years old (they tend to be precocious and unchildlike), and only discover their mind control abilities at 9-10 years at the minimum. Some of their mentors are worried if they use their mind control skills too early, they won't learn how to manipulate people in the mundane way, which will cause problems when dealing with regular humans. As an experiment, however, one of the mentors decides to teach one child to use mind control at a very young age. (They're all unaware of each other until they're older, so this has no impact on the other kids.) What impact would that have on this kid's psychological development?