As instructors, we are there to provide guidance and to answer our student's questions. Likewise, it is the student's responsibility to ask questions and to say (something, LOL) when they don't understand what's been shown to them.
Making ambiguous statements when attempting to teach someone something, is a sure way to confuse them. I've listened to a large number of lectures and seminars (over the years) and (unfortunately) making obscure and vague statements seems to be the norm for martial arts lecturers.
I think it may very well be done on purpose in many instances (it provides an excuse for the lecturer). It's easier to say that someone misunderstood what you said, than to admit that what you said wasn't correct.
For many of the subjects that are being (exploited?) peddled to the martial arts community, it's that ambiguity that seems to be the most prevalent (it helps maintain the repeat customers, LOL).
The most popular subjects being taught (at these seminars), have to do with the subjects of kyusho and/or tuite. Though neither is an individual pursuit/study, that doesn't prevent the huckster's from attempting to exploit as much money out of people that seek the easy way out of doing something (or more accurately, out of the lazy people, LOL). What I've been seeing taught (at those seminars) has been pitiful.
Being that we're in the midst of rewriting our Tuite manual, this is something that we've had to be particularly careful of. All one has to do is look upon the internet, and you can see/hear the erroneous claims, statements and explanations being made in regards to that subject.