There were other little things I didn't even realize before. While the student was watching the TedTalk video, I straightened up the papers from the previous activity. Ifka then told me that even a quieter rustling of the paper disturbed the student's attention. Then I realized that the student was unable to answer one or two of my questions, which could cause a rustle. It's just a trifle that I can avoid next time.
Ifka then told me that even a quieter rustling of the paper disturbed the student's attention.