The impending disaster of exile and destruction is painted with sudden, violent physical imagery. It is a harsh reality born not of random chance or blind fate, but of a direct decree from God [מלבי״ם].
The primary approach among commentators views the expulsion of the people from their land as being hurled away with the forceful momentum of a stone shot from a sling. In the past, during the Assyrian siege led by Sennacherib, the people of Jerusalem found safety behind their city walls. This time, however, those defenses will offer no protection, and the inhabitants will be cast far away [מצודת דוד]. This forceful removal is not limited to Israel alone. Neighboring nations, such as Edom and Moab, will also be swept away by Nebuchadnezzar, meaning they have no reason to celebrate Israel's downfall [רד״ק]. Offering a different perspective, [אבן עזרא המובא ברד״ק] suggests the imagery is literal rather than metaphorical. In his view, God will bring enemy forces armed with actual slings to shoot stones at the people.
This physical assault is paired with severe distress. Most interpret this distress as the arrival of intense hardship and damage. Yet, following his literal interpretation, [אבן עזרא המובא ברד״ק] explains that God will physically crowd the inhabitants, squeezing them into a single, narrow space so that the enemy forces can easily strike them with their slung stones.
The ultimate purpose behind this overwhelming calamity is understood in three distinct ways. The first perspective frames the disaster as strict justice, where the people finally receive the exact punishment they deserve for their sins [רש״י, מצודת דוד, תרגום יונתן המובא ברד״ק]. The suffering will be so vast that every individual will cry out over their own ruin [אביו של רד״ק]. A second approach focuses on a harsh awakening. The suffering arrives so the people will finally recognize that the warnings of the prophets were true, understanding clearly that everything befalling them comes directly from God [רד״ק]. Finally, a third view sees the agony as an opening for spiritual return. Stripped of their land and thrust into distress, the people who had long ignored the truth will be forced to search anew, ultimately finding God in the midst of their exile [מלבי״ם, ביאור שטיינזלץ].