Following a temporary agreement to stop the devastating swarm of wild animals, Moses steps away from the Egyptian king to seek mercy from God. He physically departs from the royal palace because the king's home is not a pure or fitting environment to stand before God in prayer [ביאור שטיינזלץ]. This exit is a simple, practical move to find a proper space to pray, following a pattern seen during several of the plagues [אוהב גר].
Once outside, Moses engages in an exceptionally intense and prolonged prayer. While some view his plea as a standard request [אבן עזרא], other commentators emphasize the profound quality and effort of this specific prayer. Instead of merely reciting a large quantity of words, Moses pours immense concentration and intention into the very act of praying [רש"י, ברכת אשר על התורה, דברי דוד].
This intense effort stands out when compared to plagues like the frogs or the hail, where Moses simply cried out or spread his hands. One explanation for this extraordinary prayer is that Moses needs to ensure the wild animals leave completely, at the exact time and in the exact manner he promised the king. He prays with deep focus so the animals do not simply die and remain scattered across the land, as happened with the frogs [ספורנו].
Another central approach roots this intense prayer in a spiritual principle: whatever heaven brings down to earth is not normally taken back. Moses wants the animals to vanish without a trace so the Egyptians cannot economically benefit from harvesting their skins. Asking God to completely reverse the plague and erase the animals' physical presence entirely demands an unusual and powerful effort in prayer [ריב"א, ברטנורא על התורה].
From another perspective, this deep prayer is necessary because the Egyptian king has not truly surrendered. He is still setting conditions for the Israelites' freedom. According to strict justice, it is not appropriate to remove the plague at this stage. However, Moses acts with deep compassion toward the Egyptians. He begs God to remove the destruction, even while fully aware that the struggle is far from over [העמק דבר].