It has all the relevance in the world to do with this thread. Why you choose not to see it is hardly my concern.
Um, Kungfoolss, your little "quiz" is all well and good, but how does your post have any relevance to what Anthony is saying?
What exactly does that prove? That your instructor is incompetent, or (what I tend to believe) you overestimate your abilities and your knowledge. Please explain, what reaction you expected from such a shot to your 'stomach'? To be incapacitated? Of course nothing happened, nobody I know from our system or those with professional knowledge would ever realistically expect such a poorly placed strike zone to stop anyone, even a girl. Besides, this is a ridiculous point, I have no idea whether your instructor penetrated sufficiently to damage or just to stun. The knee strike is extremely powerful, and when you have enough drive and penetration, that shot will stop anyone. Don't fool yourself.
See, I was sparring with my instructor this weekend and he landed a very nice knee to the pit of my stomach, winding me. Except, I kept on fighting for about 10 seconds -- more than enough time to do serious damage or kill if I was vicious enough, or armed. Okay, then I fell over sobbing, and he would have had me.