Charles,
I think it would be better if you do the demo first, and then they talk about the demo. That way, you have a visual in your head of what they are referring to, and can understand whatever they are referring to better. Where, if you talk about it and then do a demo, you have to try to think of what they are talking about first, and then backtrack once you do the demo and relate the demo back to what they said before.
Anyway, just a suggestion. Keep up the great videos.