The legal and practical turning point in confronting the decree of annihilation required a highly creative solution. Because Persian law dictated that a document sealed with the king's ring could never be revoked, Mordecai and Esther could not simply erase the previous orders. Instead, they drafted new letters designed to complement, interpret, and expand upon the original decree [מלבי״ם, מגילת סתרים, עמנואל הרומי]. The new correspondence was carefully framed to imply that Haman had actually misrepresented the king's will, and that the monarch's true intention from the very beginning was to allow the Jews to fight their enemies [עמנואל הרומי]. Under this new interpretation, the original directive was recast as a preparatory measure, readying the Jews to take vengeance upon the descendants of Amalek [מגילת סתרים].
To execute this defense, the new letters granted Jews across every province, city, and village the formal right to assemble [אבן עזרא, ביאור שטיינזלץ]. Because the people were scattered and vulnerable among the nations, physically uniting was an essential first step to protect their lives and survive against those seeking their harm [יוסף אבן יחיא, ביאור שטיינזלץ, אור חדש]. However, they were not limited to passive self-defense. They were given sweeping authorization to actively destroy and annihilate their attackers. This proactive measure was necessary because their enemies, particularly those of Amalekite descent, posed a perpetual threat; leaving them alive would only ensure future attempts to destroy Israel [יוסף אבן יחיא, אור חדש, עמנואל הרומי]. Furthermore, this presented a unique opportunity to fulfill the biblical Commandment to wipe out the memory of Amalek from the world [אור חדש]. The authorized warfare was absolute, directed at the armed battalions of the nations that had already been oppressing them [אבן עזרא], and permitted a complete military campaign that included striking the families of the combatants [ביאור שטיינזלץ].
Regarding the property of these enemies, the Jews were granted permission to take their spoils as a direct, measure-for-measure response to what had been planned against them [יוסף אבן יחיא]. Yet, a subtle but profound difference existed between the original decree and the new one. While the initial orders permitted destroying the Jews on one day and plundering their wealth later, Mordecai deliberately restricted the taking of enemy spoils to the exact same day as the fighting. He knew that on the designated day, the people would be entirely consumed by a commanded war against God's enemies and would have no time to gather loot. By restricting the timeframe, he effectively guaranteed they would not take the spoils, ensuring no one could accuse them of acting out of greed [מלבי״ם]. Indeed, the explicit permission to plunder was only included to perfectly mirror the unalterable phrasing of the first letters; in practice, the Jews left the wealth untouched, proving to the world that their actions were solely for survival and not for financial gain [רש״י]. This distinction also reflects a deeper philosophical difference: while other nations often view a person and their wealth as a single entity, the nation of Israel maintains a clear separation between human life and material property, viewing wealth merely as a tool to serve practical needs [אור חדש].