Making an example out of a martyr....
Not as glamorous as the title sounds.
I've seen this before in some incarnation or another. You have every reason be (have been) angry at this person because you were basically used. The method I find that is used by SOME instructors to solidify their credibility is to disprove whatever theory that seems to be in contrast to what they are teaching.
Your up son!!:
You follow your cue and enter stage right..
Let the show begin!
You were the perfect example of what not to do because (from your accounts), you were put in a funny situation. You did something your would not have normally done in that situation because you were politely listening to instruction from a person you thought was a good guy. Sounds like a big set up in my opinion. Where was he hiding that rubber knife?
I have to commend you on your take down technique. The way you describe your method is actually an optimal technique because it keeps the other guy on the floor and you on top. Then as you stated, a knee in the gut or floating ribs, some kind of lock (arm, wrist) to keep them immobilized. You get a nice view of things just in case the other dude is getting ideas and your are in a good spot to deal with anything or to just take off and run. One thing I was taught was to make sure that they are not completely on their back, that they are positioned on their side, which makes it more difficult for a counter and opens up a lot of easy targets.
You may have been perceived as showing off and someone felt that you needed to be put in your place....one possible reason. But I wasn't there and I have naught any psychic powers to delve into the minds of others. My conjecture, is from the point of an instructor trying to keep interest and order within his school.
Do you not find it an honor that you are useful? J/K dude.
And the guy with the comments...how old was he? I find that a lot of young people like to mouth off even against older and more senior students if they think they are better or if you are better and just happen to have a bad day in training. Usually the sign of a kid who has a lot of growing up to do (yes, there are adults who have not yet grown up). Maybe you'll get a chance to "play" with him on your terms in the near future.
Take this as a learning experience of what not to do. Your skill is your own and it seems as if you are good at what you do. Grappling is very fun but I myself am a bit out of practice at the moment Currently just trying to get back into it...slowly but surely. When in the presence of other schools or styles, I don't really give it all away in the beginning. I'm not an attention seeker by any means and do not owe anyone any explanation about my experience...unless I know and trust you to some degree.
Don't want to sound preachy but I def sympathize with what happened.
Take care.
Cordially yours,
冠木侍 (KS)
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"Jiu mo gwai gwaai faai dei zau" (妖魔鬼怪快哋走) -- The venerable Uncle Chan
"A fool with a sword is more dangerous than any weapon..."
“If your actions inspire others to dream more, learn more, do more and become more, you are a leader.”--John Quincy Adams
"If you have an unconquerable calmness, you can overcome the enemy without force" -Bushi Matsumura