Read it through once

One afternoon late in October I saw Tom Buchanan. He was walking ahead of me along Fifth Avenue in his alert, aggressive way, his hands out a little from his body as if to fight off interference, his head moving sharply here and there, adapting itself to his restless eyes. Just as I slowed up to avoid overtaking him he stopped and began frowning into the windows of a jewellery store. Suddenly he saw me and walked back, holding out his hand.