The Third Prince consulted the Emperor on some issues regarding knife techniques, for he usually liked carrying a short knife when going out, which allowed him to enjoy himself and also to protect himself, while the Crown Prince just watched how patiently his brother taught their siblings.
There was not a trace of pride from being praised, only a sincere guidance, treating them exactly as if they were his own brothers.
Therefore, the Crown Prince found himself unable to feel jealous or hateful towards his brother. If his brother had appeared boastful as a successful person, he might have wanted to challenge him to a duel, but he was being so humble yet so capable.