A noble person seeks a fair outcome even when disagreement arises. They do not exploit a weaker person's lack of information. An unscrupulous person may use hidden tricks, break trust and justify this as cleverness.
For example, when selling an item, explaining a known defect is consistent with noble dealings. Concealing the defect to obtain a better price is deceit, even if the sale is conducted with a smile.
This practical contrast connects the first two narrations: thoughtful action protects us from an angry mistake, while noble character protects others from our deliberate wrongdoing.