1)
Why does it say "Haman Amad Levakesh"?
1.
Vilna Gaon, Malbim: After the king left, he requested his life and gave the excuse that he could say in front of the queen alone (he would not have wanted to kill all the Jews had he known that they are her nation).
2)
What is the meaning of "Kalsah"?
1.
Rashi: The evil, hatred and vengeance were completed.