Wei Wuxian demonstrates his unconventional ingenuity by using resentful energy to track the ghouls, though he is reprimanded by Jiang Cheng for these risky "heretical" ideas.
Wei Wuxian's suggestion to use "resentful energy" to fight spirits is the first explicit mention of the "Heretic Path". It establishes the core conflict between his practical, results-oriented morality and the rigid traditionalism of the cultivation world. Mo Dao Zu Shi Episode 5
If you are looking for from later seasons, the stakes are significantly higher: mutual respect. Loss of Innocence
The "Waterborne Abyss" incident serves as a catalyst for dynamic. Lan Wangji’s act of saving Wei Wuxian signals a shift from mere classmates to a deeper, albeit complicated, mutual respect. Loss of Innocence Mo Dao Zu Shi Episode 5