I like that the teacher is giving challenging words, but I think the teacher isn't being too thoughtful re: release of his kid's private medical condition. I wouldn't be too happy when I grew up to have someone say, "Oh, I know you. I had your dad as a teacher and learned all about your medical condition in spelling." He could do similar things with roots with words that might have more usefulness to the kids (e.g., related to something they are studying).