You don't read very well. That was in 2013 when he missed a day of work (used a personal day). He had a meeting and the AD voiced his displeasure in using vacation time mid-season.
It sounds like he ran boston and missed practice, missed a class he was supposed to teach, and potentially prevented the team from being able to compete. And I'm sure there is more to it—his relationship with the AD must have gone sour previously.