"Simon had passed through the area of fruit trees but today the littluns had been too busy with the fire on the beach and they had not pursued him there. He went on among the creepers until he reached the great mat that was woven by the open space and crawled inside. Beyond the screen of leaves the sunlight pelted down and the butterflies danced in the middle their unending dance. He knelt down and the arrow of the sun fell on him. That other time the air had seemed to vibrate with heat; but now it threatened. Soon the sweat was running from his long coarse hair. He shifted restlessly but there was no avoiding the sun. Presently he was thirsty, and then very thirsty. He continued to sit."
Which word from the passage above most clearly foreshadows trouble?