My favorite instructor taught short courses to maybe fifteen or twenty people, sometimes as many as thirty. With one to four days to teach a lot of material there wasn't much time to spend with one student that disagreed with the way things worked or was like a small child that will just ask "why" over and over no matter how you explain something. Tony might spend five to ten minutes with someone if he felt others in the class might be gaining too but after explaining a few different ways and failing to satisfy someone his final explanation was "Magic!" I learned that and when all else fails I just tell people it is magic!If you explain something five ways and still get a blank stare it may be time to tell the student to take up bowling.
In fairness to Tony, if he did think somebody was genuinely lost concerning something that they needed to understand he would tell them to catch him at break time or lunch.
Hu