I love when he tells anecdotes about things that happened to him during 30 years of live shows.
One of my favorite, for example, is the one when he was about to sing “Memory Motel” with the Stones and he completely forgets the lyrics.
https://youtube.com/watch?v=sOUy5TBWcYI
I’d take advantage of the fact that it is not an interview but something more confidential to ask if he had any other story like that, fun things that happened during a concert, before of after that, maybe even something that he would never say in a real interview.
Since I am getting involved into NVC, if it was me, maybe I would simply ask if he would like to tell how he feels. That’s a huge question.