In Act 3 Scene 3, of Desdemona’s supposed infidelity? Act 3 Scene 3 is, arguably, the most important scene in the entire play, for it is the point of no return. It is as if for the entire beginning of the play you were pushing a huge boulder up a steep mountain, and in this scene you reach the top, and push it down the other side, helpless to stop it. This is how I see the action in Othello. Iago spends the whole time plotting, and conspiring with the audience, and in this scene you can actually pinpoint the line where he finally pushes ....