In this moment Prometheus is arguing with Zeus about humans having fire. Zeus did not want humans to have fire because he said that humans are happy without fire and they shall stay like that until some one pres wades him that he is unhappy.
When Prometheus finish his argument with Zeus he sets up a plan to give humans fire. When he finished his plan he went down the mountain and gave humans fire but humans did want it when he burned a dear nearly dead the cooked meat made the humans jump to meat.
When humans got fire a couple of years later humans evolved they used weapon as gods, had wars as gods,and when Zeus looked down he was in rage. Zeus got his largest lightning bolt and said humans fire i will set there world into crisp but he said no i want to see them destroy them self