This was actually a test for Cu Chulainn.
He had imagined that the scenario of the two getting along would start with Jiang Lu being late, and then annoying Edison, because Edison always hated people who were not punctual.
And since he was hot-tempered and not a smooth talker, even if Jiang Lu was technically his friend, Edison would certainly express his dissatisfaction.
But since Jiang Lu was equally stubborn, there would surely be a conflict between the two.
So, even if they didn't part on bad terms, Jiang Lu's harp learning journey would certainly become difficult.
And as for Edison, who was already the best harp musician in Alster, he had found a harp teacher for Jiang Lu as agreed, but if he himself was not up to par, then no one else was to blame.'
However, if that were the case, it would prove that Jiang Lu had indeed remained steadfast and unyielding. For his admirable spirit alone, it wouldn't be out of the question to spare his life during the duel.