1. Iago’s displays a cruel attitude toward Roderigo and Cassio. He uses them for his goals and plans. Up to now their death is more valuable then being alive. For example, when Cassio dies, Iago’s plans cannot be revealed. On the other hand, if Roderigo dies Iago does not have to reimburse him for the jewels.
2. Othello comes to think Iago has kept his vow when he hears Cassio is crying; after that incident he believes that Iago has kept his promise
3. Lodovico and Gratiano’s presence provide man functions. First, they act as an “audience” for Iago’s plan to shed off all suspicions. Second, when they enter the street at the cries for help “let’s think unsafe…To come into a cry without more help” this suggests that there is still danger.
4. Iago stabs Roderigo to make sure that his scheme is not revealed.
5. Iago casts aside suspicion of his own part in the plot to kill Cassio by blaming the murder on Bianca “I do suspect this trash to be party in this injury”. He uses Bianca as a bait to pretend that an investigation will expose her role in killing Cassio
6. Iago shows a change of heart towards Desdemona when he sees her sleeping in the bed and describes her as “the whiter skin of hers that snow… and smooth as alabaster” made him not to “shed her blood”.
7. The handkerchief was a gift from his mother; its impact will bring happiness to a marriage. Moreover, the handkerchief was the “ocular proof” that he order to believe Iago’s accusation. The handkerchief wounded Othello when he heard and saw Cassio holding it.
8. Othello thinks that murder will get the justice needed to end this treason. He killed Desdemona because of his jealousy on here. He considers Desdemona as a liar when she denies giving the handkerchief to Cassio.