There's no incompatibility, there's no "extra time" appearing from nowhere. Stop taking teaching tools as gospel, and think it through. You've been given all the information you need to sort this out. Multiple times and ways even.
I'm bowing out of this one I think. It's clear he doesn't wish to understand, is continuing to pretend he doesn't understand for some reason, or he never will because he somehow can't grasp basic concepts of motion. Best of luck to those who continue to try, and to you as well Tom.