The vast majority of great teachers were humble and acted poise on the surface. But in their bones, who among them wasn't proud and arrogant?
The more impressive a great teacher, the greater their sense of superiority would be. They would have pride in themselves and high ego. Only then would they be able to nurture their students into elites.
In the great teacher world, there was a hidden rule everyone knew about. If you wanted to awe someone, you had to crush them at the aspect that he or she was the most confident about.
Make your opponent concede wholeheartedly!
Sun Mo was said to be an ancestor-level spirit runist, and spirit gathering runes were considered the most basic out of all basic runes in the study of spirit runes. Hence, Lu Jian chose a spirit gathering rune to test Sun Mo.