The following excerpt from chapter 6 of Emily Brontë's Wuthering Heights features Nelly’s description of Hindley’s wife, Frances. Which literary technique is evident in the mention of Frances’s quick breathing and troublesome cough?
Then she began describing with hysterical emotion the effect it produced on her to see black; and started, and trembled, and, at last, fell a-weeping—and when I asked what was the matter, answered, she didn’t know; but she felt so afraid of dying!  I imagined her as little likely to die as myself.  She was rather thin, but young, and fresh-complexioned, and her eyes sparkled as bright as diamonds.  I did remark, to be sure, that mounting the stairs made her breathe very quick; that the least sudden noise set her all in a quiver, and that she coughed troublesomely sometimes: but I knew nothing of what these symptoms portended, and had no impulse to sympathise with her.