Professor Severo was a man who would be considered special by all parameters. This was so not because of his special elemental attribute, but rather, because of his personality as an individual.
Those students had never seen anyone like him.
It turned out that his personality seemed unstable, one moment his demeanor revealed a good mood, and the other his attitude would be that of severity. Unfortunately, they ended up suffering for it.
His first meeting with them had been as severe as it was because he had not been in too good of a mood.
Nevertheless, there was one detail consistent no matter how he felt. This was his method.
The man had strange ways of lecturing them, and each class saw him do something unique and sometimes completely outlandish.
He seemed to embody the academy's capacity to only care about those who indeed rose to meet its standards.