"He hath, my lord, but be you well assured/No more than he’ll unswear" IV. i. 20-21. Dramatic suspense is created because the reader knows much more than what Othello, Cassio, and Roderigo know. All three of these men think that Iago is on their side and that he is actually is their friend, but when in fact he is working against all three of them. He is only on his side in the end. The reader knows and understands that Iago has ulterior motives. The reader knows that Iago is working against and around all three of them and only wants to get himself ahead. However, since Iago accomplished what he wanted, he is still working against them because he is already so far into his plan. The reader knows that Iago is manipulative, but the three men do not.