Read the excerpt from act 2 of a doll's house. helmer: rank led me to expect a splendid transformation. rank: [in the doorway] i understood so, but evidently i was mistaken. nora: yes, nobody is to have the chance of admiring me in my dress until tomorrow. helmer: but, my dear nora, you look so worn out. have you been practising too much? nora: no, i have not practised at all. helmer: but you will need to— nora: yes, indeed i shall, torvald. but i can't get on a bit without you to me; i have absolutely forgotten the whole thing. helmer: oh, we will soon work it up again. nora: yes, me, torvald. promise that you will! i am so nervous about it—all the people—. you must give yourself up to me entirely this evening. not the tiniest bit of business—you mustn't even take a pen in your hand. will you promise, torvald dear? helmer: i promise. this evening i will be wholly and absolutely at your service, you little mortal. ah, by the way, first of all i will just— [goes towards the hall door.] nora: what are you going to do there? helmer: only see if any letters have come. nora: no, no! don't do that, torvald! helmer: why not? nora: torvald, don't. there is nothing there. how does ibsen use dramatic irony to create suspense in this passage?