Aiki Lee
Master of Arts
If this guy is learning and the instructor is good then what's the problem. Plus, maybe its a test. Maybe the instructor uses this process to weed people out. Maybe the instructor doesn't care to teach actively, does this mean his knowledge is any less useful?
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The instructor may be skilled and knowledgeable but the behavior being described is not professional or even safe for martial arts. I agree with pretty much everything Xue and Celtic crippler said. If the instructor is not watching the students then he is not actively teaching. He is being paid to share his knowledge of martial arts and that goes beyond just introducing new movements every 15 minutes.
I do know that some instructors will purposefully not correct students when observing minor, lower danger risked errors. Often times the instructor does not want to overwhelm students with too many corrections at once or give them the false impression that they can't do anything right. Sometimes instructors leave you to your own devices to see if you can correct your own mistakes. However the teacher should always be watching for safety reasons.
I recommend asking politely that your instructor monitor your movements to see if they are correct. If this behavior continues and you do not get the service you want, you may need to look elsewhere. It would be sad though if this is the only guy in the area who can teach this art.