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Why does Otello demote Cassio after the fight with Montano?

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In Giuseppe Verdi’s opera Otello, Otello demotes Cassio because he is infuriated to discover that a drunken Cassio has wounded Montano, the former governor, during a fight.1

Although Iago orchestrates the situation by plying Cassio with drink and manipulating him into the altercation, Otello is unaware of Iago's deception at that moment. Upon arriving at the scene and seeing the injury inflicted upon Montano, Otello views Cassio's behavior as a serious breach of conduct and discipline, leading him to strip Cassio of his rank.1