The sudden collapse of a massive empire sends shockwaves of panic across the living world, yet paradoxically brings a grim sense of comfort to those already in the grave. The prophetic vision shifts from a parable to its direct meaning, illustrating the downfall of a mighty king and the dramatic ripple effect his destruction has on other nations.
The mere sound of this monumental fall is enough to cause widespread terror. God causes the surrounding nations to shake with panic and dread, as they are gripped by the fear that a similar disaster might strike them [מצודת דוד, מצודת ציון, שטיינזלץ]. The reality of this defeat is absolute; the great king is brought down to the grave, joining the ranks of the ordinary dead [מצודת דוד, אברבנאל].
However, in the world of the dead, the reaction is entirely the opposite. Those who have already descended into the grave find consolation in his arrival. The primary approach among commentators roots this in human nature: when people suffer a tragedy, seeing that same fate strike someone far greater and stronger brings them a sense of relief. The dead are comforted by the sight of the once-mighty king suffering the same punishment, realizing that he has been reduced to the exact same state of weakness as they are [רש"י, מצודת דוד, רד"ק].
To describe these inhabitants of the underworld, the vision continues to use imagery from the plant kingdom. The majestic trees and the finest cedars represent the world's most respected kings, ministers, and counselors who were previously cut down by the sword and sent to the grave [מלבי"ם, מצודת דוד, שטיינזלץ, אברבנאל]. Furthermore, the imagery of well-watered trees [מצודת ציון] serves as a symbol for rulers who once enjoyed immense wealth and success in their own kingdoms [אברבנאל]. Alternatively, these well-watered trees represent the king's former allies, those who once lived comfortably under his protection but ultimately followed him down into total destruction [מלבי"ם].