Ah, well if you're competing for the same territory that's
  different. You're equals in that case and it's not
  master/student anymore. In short, it sounds like you got used
  for their gain. Your compassion was used against you in the end,
  a betrayal of confidence and trust and respect. Master level has
  nothing to do with age: it's approach towards the student.
  They're never your competition, even when they compete against
  you. They may see YOU as equal and they can do that. But the
  moment you see THEM as equal, or treat them as equal, there's no
  more master/student. == In the business world, for example,
  there's a 'thing' about that: "Never tell them everything you
  know" because when you do, it will get used against you. That's
  because in business, there is no master/student. It's a level
  playing field of opportunity for all, which is one of the things
  that can make it vicious. ==