Is it easy to be a student of an executioner? Of a great, brilliant executioner? Probably not. And if one day, your master should become your victim? Then, you have to remember that: "Master cannot teach bad things."
The short story "MASTER" by H. L. Oldie got "FANCON" Prize as "The Best 1994-95 SF & Fantasy Short Story in Russia and Ukraine" in 1995.