A sharp shift occurs, moving from the image of God as a safe shelter for those who trust Him, to His appearance as an absolute, destructive force wiping out wickedness. The central picture is of an unstoppable natural disaster that suddenly and permanently erases enemies from the earth. The destruction is compared to a fierce, rushing river [מצודת ציון, אבן עזרא]. Commentators understand this rushing flood in several ways. Some see it as a picture of God's overflowing anger [רש״י]. Others view it as a metaphor for the invading army of Nebuchadnezzar, which will wash over the land and consume everything like a massive flood, leaving no survivors behind [מצודת דוד]. A different approach suggests this is a literal historical event, where the waters of the Tigris River overflowed and physically destroyed the city of Nineveh at God's command [מלבי״ם]. Ultimately, God moves through the world to put an end to suffering [ביאור שטיינזלץ, מלבי״ם].
The ruin of Nineveh will be distinct in its finality. While the exile of the Israelites happened in stages over a long period, the destruction of Nineveh will be absolute, rapid, and occur all at once [אבן עזרא, אברבנאל]. There are different views on exactly what location will be wiped out. One approach connects this destruction to earlier themes, suggesting it refers to the entire earth bearing God's anger [רש״י]. However, the primary approach among commentators is that the target is the city of Nineveh and the Assyrian empire. The flood of destruction will be so severe that the city's location will no longer be recognizable as a place where people once lived [רד״ק, מצודת דוד]. The very site that served as the source of evil and trouble for the world will be entirely erased [ביאור שטיינזלץ, מלבי״ם].
In the aftermath, the people of Assyria will be pursued by darkness [מצודת דוד, אברבנאל]. This darkness serves as a metaphor for intense suffering and disaster [רד״ק]. God Himself commands this darkness to chase after the enemies [רד״ק, מלבי״ם]. It hunts them down and forces them into a dark space where they cannot even see the ruin coming toward them. They will run in panic, fleeing as if trapped on a dark and slippery path [אבן עזרא, מלבי״ם].