A direct declaration of war from God carries the weight of absolute certainty. When God turns His attention toward Mount Seir, it is not a mere warning, but a clear and purposeful move into battle, accompanied by the threat of total destruction. The prophetic message frames God as actively preparing to strike, using the imagery of raising a hand to illustrate the preparation for a severe and crushing blow.
The aftermath of this strike is one of complete desolation, highlighted by a doubled expression of emptiness. This repetition serves to emphasize the extreme intensity of the ruin and the vast wasteland that will be left in its wake [מצודת ציון]. The destruction will be so absolute that anyone who witnesses the remains of the mountain will be left completely shocked and stunned by the sight [ביאור שטיינזלץ].