Let's see...the team lost with his coaching and won without his coaching.
I don't know what lesson he thought he was teaching them, but I'm sure it wasn't the one they learned.
I teach high school. If I ever left my classroom because I was pi$$ed off and wanted to teach my students a lesson, I'd certainly get fired.
If a coach lacks motivational skills to the point the team works better without him...well, sort of speaks for itself.