In the previous chapter we saw the king completely forget that Mordecai had tipped him off to an assassination plot. Now, the king has completely forgotten that in Ch. 3, he had ordered the murder of the Jews at the behest of Haman. Just in case there's any doubt or confusion, I'll reproduce it here. Obviously, the king has Alzeheimer's disease, because he has no memory of this.
8 Then Haman said to King Xerxes, “There is a certain people dispersed among the peoples in all the provinces of your kingdom who keep themselves separate. Their customs are different from those of all other people, and they do not obey the king’s laws; it is not in the king’s best interest to tolerate them. 9 If it pleases the king, let a decree be issued to destroy them, and I will give ten thousand talents[b] of silver to the king’s administrators for the royal treasury.”
10 So the king took his signet ring from his finger and gave it to Haman son of Hammedatha, the Agagite, the enemy of the Jews. 11 “Keep the money,” the king said to Haman, “and do with the people as you please.”
12 Then on the thirteenth day of the first month the royal secretaries were summoned. They wrote out in the script of each province and in the language of each people all Haman’s orders to the king’s satraps, the governors of the various provinces and the nobles of the various peoples. These were written in the name of King Xerxes himself and sealed with his own ring. 13 Dispatches were sent by couriers to all the king’s provinces with the order to destroy, kill and annihilate all the Jews—young and old, women and children—on a single day, the thirteenth day of the twelfth month, the month of Adar, and to plunder their goods. 14 A copy of the text of the edict was to be issued as law in every province and made known to the people of every nationality so they would be ready for that day.15 The couriers went out, spurred on by the king’s command, and the edict was issued in the citadel of Susa. The king and Haman sat down to drink, but the city of Susa was bewildered.
7 So the king and Haman went to Queen Esther’s banquet, 2 and as they were drinking wine on the second day, the king again asked, “Queen Esther, what is your petition? It will be given you. What is your request? Even up to half the kingdom, it will be granted.”
3 Then Queen Esther answered, “If I have found favor with you, Your Majesty, and if it pleases you, grant me my life—this is my petition. And spare my people—this is my request. 4 For I and my people have been sold to be destroyed, killed and annihilated. If we had merely been sold as male and female slaves, I would have kept quiet, because no such distress would justify disturbing the king.[a]”
5 King Xerxes asked Queen Esther, “Who is he? Where is he—the man who has dared to do such a thing?”
6 Esther said, “An adversary and enemy! This vile Haman!”
Then Haman was terrified before the king and queen. 7 The king got up in a rage, left his wine and went out into the palace garden. But Haman, realizing that the king had already decided his fate, stayed behind to beg Queen Esther for his life.
8 Just as the king returned from the palace garden to the banquet hall, Haman was falling on the couch where Esther was reclining.
The king exclaimed, “Will he even molest the queen while she is with me in the house?”
As soon as the word left the king’s mouth, they covered Haman’s face. 9 Then Harbona, one of the eunuchs attending the king, said, “A pole reaching to a height of fifty cubits[b] stands by Haman’s house. He had it set up for Mordecai, who spoke up to help the king.”
The king said, “Impale him on it!” 10 So they impaled Haman on the pole he had set up for Mordecai. Then the king’s fury subsided.