In this reading we here Esther call Haman, "an enemy, an adversary." Ha satan....the adversary is always at work against God and God's people. This is evil that is present. Satan is constantly attempting to defy God and God's people and draw God's people further and further away.
Mordecai and Esther certainly have already experienced this in the exile from Judah, but now experience it first hand through one man's hatred. Haman represents the demonic forces of this world. But before getting to caught up in seeing his demise, Paul reminds us in the book of Ephesians that "it is not flesh and blood that we fight against but powers and principalities of an unseen dark world."
God works through Mordecai and Esther...."for such a time as this."
Kairos moments (God's timing) like this provide us to ask one another two questions:
1) What is God calling you to?
2) What are YOU going to do about it?
Strengthen us each day Lord as we continue to be embattled by the enemy, even as the one we know may fall away, the enemy is ever present before us. Empower us and protect us.