What does this passage add to your understanding of the relationship between Othello and Iago?
In this scene Iago persuades Cassio, who is on watch, to drink, knowing that he is not a drinker and that he will be easy to antagonise. Roderigo provokes Cassio into a fight and Othello, hearing the disturbance, arrives to find the nobleman Montano seriously injured. Cassio gives no explanation, Montano pleads self-defence, and say that Iago knows best, so Iago is ordered to speak, ‘Iago, who began’t?”
This passage starts with Othello, who appears to have interrupted someone, as there is a line break. This along with the language Othello uses shows his frustration and annoyance at this encounter. This is seen when he relates religiously to the situation, ‘by heaven’. Othello’s language starts to deteriorate in this section, from that of a commanding general, to the similar uses of imagery used by Iago. His ‘blood begins safer guide to rule’, he is ruled by his blood, his ‘passion’, not his rational thinking brain, as if he is thinking in an instinctive fashion. This part of the passage is proleptic of Othello’s gradual downfall, his loss of mentality, and his clear and definite change in language. His linguistic degeneration is also seen when he uses the blasphemous phrase ‘Zounds!’ Othello calls this a ‘private and domestic quarrel’, but this event all adds up to the eventual tragedy of the story. This can support A.C. Bradley’s theory that an ‘exceptional calamity’ leads to the “death of a man ‘in high estate”. Yet, Othello contradicts himself here, because it is his own ‘domestic quarrel’ that leads to the murder of his wife, and others in the play. Othello is not thinking rationally, and the reader can see this dramatic irony straight away.