You have it exactly right. I always told the candidate in my introductory email that the segment is optional and I like to learn all varieties of new things and

You have it exactly right. I always told the candidate in my introductory email that the segment is optional and I like to learn all varieties of new things and they should feel free to pick any topic they want. And then when they were teaching me, I made sure to pay attention, ask questions about anything I didn't understand - not to judge their teaching skills but to show I was interested and listening.