Here Othello and Iago are seen again, and as the scene unfolds we observe Iago playing mind games with Othello once more.
Iago
Iago tries to get Othello to imagine Desdemona and Cassio in bed together and then brings up the tragic symbol of the handkerchief.
Iago continues where he left off, forcing Othello to discuss the handkerchief and Desdemona’s honesty.
Iago manipulatively claims that Cassio has admitted the affair to him, provoking Othello to fall into a fit.
Cassio
Cassio appears during Othello’s fit but Iago gets rid of him quickly.
When Cassio returns, it is to be an unwitting performer in a piece of drama engineered by Iago, with Othello as witness, whereby Bianca becomes a substitute Desdemona as the topic of conversation.
Bianca
Suddenly Bianca appears in person at this point, and throws back the handkerchief in the sight of Othello.
Cassio runs after her, which gives Iago the opportunity to move Othello onto the point of agreeing that Desdemona and Cassio will die together that same evening.
Domestic violence
Relatives of Desdemona, who are acting as officials from Venice, arrive with a letter for Othello.
In front of them Othello strikes her and they are shocked by his behaviour.
Lodovico is told by Iago that this is typical of Othello’s current behaviour.
Sadistic malice
Iago is lucky in that Bianca turns up to reject the handkerchief at the appropriate moment, and she unwittingly confirms Desdemona’s death sentence.
He even knows that Cassio can be counted upon to laugh excessively.
His addressing of Cassio as ‘Lieutenant’ is sadistic malice.
Reputation
The arrival of the Venetians to relieve Othello and to promote Cassio - although logical, since the Turkish threat has been temporarily removed - seems to be an indictment of Othello and a confirmation of Cassio as his replacement in love and war.
Striking a woman was regarded as a cowardly and dishonourable at the time, especially in public, and this action damages both their reputations.