Kretos was trying to teach Afeus his way of using mana. Though Kretos knows how to use the elementals to perform high-level spells, Afeus didn't want to learn that. What Afeus wanted to learn was how to control mana in a way that you can use it without chanting spell words. Though the knights of the Reschbeauch Kingdom could do something similar, it looks like Kretos's way was more efficient.
As Kretos was teaching Afeus how to properly circulate his mana, someone unexpected came to disturb them. Evior the frightened little student Kretos almost killed when he woke up, was approaching alongside several dozen of his lackeys.
When Kretos saw the group coming for him, instead of being afraid like the other students, he wondered why this particular group of people doesn't seem to be researching. He has been in this school for a couple of days now, and the first thing he noticed was the obsession each individual had with their perspective research.
