No I did not read the article, I watched the clip. The article mentioned the supervisor is able to speak Mandarin, but was not intervened until a crew member eventually asked. I'm not expecting all crew to speak Mandarin, I'm expecting a Mandarin speaking crew member to handle the situation right away, not after an incident begins to go out of control or rely on other passengers to translate. I can't speak for the other passenger but not native speaker can easily go from "please lower your voice" > "She said shut up" in translation. That's why it's critical to have the crew handling it instead of relying on others. Honestly, do you think Karen will go increasingly frustrated if she was addressed in Mandarin right away instead?

"Jismah stated, “I approached her and politely asked her to lower her voice, but since she didn’t understand English, another passenger helped translate. That only made her angrier, and she vented her frustration at the passenger who assisted me.” Jismah added, “We eventually asked a supervisor who speaks Mandarin to intervene, but the woman confronted the supervisor and demanded to disembark. The pilot ultimately decided to return the aircraft to the gate.”"