I just can’t explain this in Japanese. I demonstrated with my own piece and they were ready. With scissors in hand they were giggling and saying it was muzukashi (difficult) and kowai (scary).
I was happy that no one cut the wrong thread. Even though I could fix my own if I cut the wrong thread, I don’t know how to explain how to fix it.
Our project only uses wrapped bars, but I pulled out this practice piece to show examples of other fillings.
I think they were happy with their progress for the day. I am.