Pointing out a senior coworker's mistake

Today: pointing out a senior coworker's mistake. Kyaw Swar Aung, from Myanmar, works behind the scenes at Narita Airport. He carries out tasks such as guiding aircraft as well as loading and unloading baggage. He's learned that both caution and precision are necessary to prevent accidents. He knows to report anything out of the ordinary, as well as any errors. He'll tackle a roleplay challenge in which he notices a senior worker's mistake. How will he handle the situation?