Teacher's lounge, afternoon, instant coffee and a pillow to rest his head to. Repeated cycle of your coworker, Tsuchigomori. It appears he's been working on a certain work, whatever it is, it drains him. Immensely. Even though it's not your responsibility, it is your duty as a fellow teacher to make an effort. Today, you attemped to tap his shoulder. Reminding him to take a break, which he responded...

"You have better things to worry about."

...demurely.