Obliterating the student does not teach them that the technique is crap, it mearly shows them that every time they go out to another class and observe a new technique, when they come back you can, and will, kick their ***. So I dont think everyone follows your logic path.
If I have a choice between saying "don't do this because I said so" or physically demonstrating why this technique isn't a good idea, I usually go with the physical demonstration. Say Student A comes back with a really cool high kick that he picked in another school, one that tends to leave the groin exposed to execute. I may not even need to explain anything, just pop him in the groin every time he tries to pull that off. I then explain to the rest of the class the counter to the technique and then let sparring continue. Odds are that particular kick will go by the wayside rather quickly.
Stealing the technique because, as you say, "If the technique is great you should be stealing it" shows that someone is not an instructor/student in an art but mearly a cockroach that scurrys about getting what they can find.
Uh huh, are you saying TKD (or any art) sprung full-fledged from the mind of a single person without any outside influence? By your definition I think we are all cockroaches, or maybe some of us are cockroaches and others are clones of cockroaches.
As it said, the instructor decides what is taught and not taught, thus the name instructor. If a student wishes to be their own instructor, that is cool also, they can just do it somewhere else. But what makes you think any good instructor would share their most valued pearls of wisdom with a class hopper. HA
I teach everyone who comes in my door, equally to the best of my ability. Do you pick favorites?
Then there is no issue about a student using this not-really-an-outside technique.Please re-read the post as it said decide, not reject everything.
Therre are several possibilities, not just the one you are jumping to.
It may already be a part of the art
The student already has it, knowledge doesn't go away, whether she is following your normal progression or not. Is your response "don't use this until I say so" or do you fix the issues the student has?It may be a part of the art that that the student is not ready for
No issue then, give your other students a moving dummy to practice on should they decide to retain a crap technique.It may be just crap.
I respect my instructor highly, but I don't need to shut off my brain to do so. The simple fact is, my progress is mostly my responsibility as well as his, and I have to make decisions about what and how I study.
As an instructor, I am a guide, not an autocrat.
Lamont