The more I think about it, it made me realize a similar scenario happened at my HS.
A veteran from Iraq came to my HS (sonnen) came to speak about PTSD which he suffered from. He suffered heavily from the disorder and it also prevented him from gaining a permanent position as a teacher which he was well suited (had a degree and etc).
One teacher did not show up to work one day (hendo), causing the school to look for a sub.
The popular sub who was an alum and star athlete (shogun, machida) who was trying to get a full time position at the school said no, they wouldn't come in due to already working, too short notice, etc.
Well the veteran cancelled his speaking obligation and subbed in for the teacher. After the year ended he was rewarded with a full time position and the popular sub, well, is still subbing. He still bitches about it today, to my knowledge.