Commentators explain that Isaiah uses three powerful images to describe God's judgment. His "breath" is like an overwhelming flood that sweeps everything away. He sifts the nations with a "sieve of destruction," meaning one that scatters and annihilates, not one that preserves. Finally, He places a "bridle" in their jaws, showing His absolute control to lead them to their ruin. This judgment is portrayed as total and inescapable.