The coach should notice who has stopped asking questions because the answers feel unsafe.

Silence gets mistaken for understanding. Someone made to feel foolish once simply stops asking, and from the front of the room that looks like progress. The questions you no longer receive tend to be the ones that would have told you where the teaching failed, and their absence is not good news.

If nobody asks you anything, treat that as a finding rather than a relief. Go to the quietest person directly, ask what is still unclear, and take the first vague answer as an invitation to wait longer.