No. At first, he doesn't give any indications to check if the candidate recognize this lack of understanding. As you said it very well: If you're going to c

No. At first, he doesn't give any indications to check if the candidate recognize this lack of understanding. As you said it very well: If you're going to cut out all the vital clues, how you can expect it not to fail horribly? Feedback from both sides is essential. If your audience doesn't acknowledge your basic explanations, it's not worth going deeper in the subject. I.e. If you get no clue, go get them!