"I'm sorry, I couldn't actually focus on this without more effort than I think wise.  My brain is repeatedly calling attention to the point that this has been your first formal learning experience with structural uncertainty.  Was it - fun, awful, funawful?  I can go away if you don't want to think about work until we resume, but it doesn't sound like that's your usual rule."

"I'm sorry again, I couldn't actually focus on this without more effort than I think wise.  My brain is repeatedly calling attention to the point that this has been your first formal learning experience with structural uncertainty.  Was it - fun, awful, funawful?  I can go away if you don't want to think about work until we resume, but it doesn't sound like that's your usual rule."