On Killing Students
Once upon a time a friend’s psyker Player Character, Toby, decided to take as a student another Player Character, Reiko. Toby did this despite her known erratic personality. Reiko had already manifested some uncontrolled psychic ability. Toby recognized that if he did not teach her, someone else would.
He did not dismiss his concerns about her character’s character. Instead, he emphasized them in a no-nonsense lecture. He made it plain to her that his motivation was as much for the safety of the community as it was for her own. Should Reiko ever intentionally misuse what he teaches her, Toby said to her face, “I will end you.”
This scene predates Star Wars: The Last Jedi with Luke’s aborted killing of his student, Ben Solo. These are the only two instances of I know where a teacher/master is prepared to kill a student going-but-not-yet-gone rogue. The literary trope is a younger student sent against a rogue ex-student of the same master(s), e.g., Enter the Dragon.
In a milieu where great magical and/or psychic powers exist, this vigilance and grim contingency needs to be standard procedure for every teacher of them.