As an adult, I retreat like this when I need a break. Doing a quick assessment of importance/urgency gives me an idea of what I can afford let slide-- maybe your son is at an age where he's internalized this sort of process? (Or maybe he did this long ago.)

I can't comment on the disciplinary side, as I haven't been in a similar situation yet. My son is too young, so it would just be a lot of hot air!

What is to give light must endure burning.