Following the shock of seeing men survive a raging inferno, a complete transformation overtakes the King of Babylon. The mighty ruler, who initially observed the execution from a distance, now approaches the very gate of the furnace courtyard to speak directly with the condemned men [רש"י, אבן עזרא]. He openly acknowledges that this miracle is the undeniable work of the supreme God, a force before which all of nature must submit [מלבי"ם, יוסף אבן יחיא].
When addressing the men, the king calls them by their Babylonian names but immediately adds the title "servants of the Most High God." This deliberate combination serves a public purpose. It clarifies to everyone present that the men were not saved by the pagan idols whose names they were forced to bear, but entirely because of their devotion to God [אלשיך].
The king instructs them to step outside, using phrasing that implies walking out on level ground rather than climbing up from a pit. This hints at an additional miracle, as the floor of the deep furnace actually floated upward until it was perfectly even with the surrounding earth, sparing the men the effort of climbing out [רש"י, מלבי"ם]. Furthermore, the structure of the furnace itself was broken apart, allowing each man to walk out through his own separate breach rather than crowding through a single exit [מנחת שי].
The men only emerged from the flames after being explicitly called. This delay raises a question regarding why they did not leave the fire the moment they realized they were safe. The primary approach among commentators is that despite experiencing a clear miracle, the men refused to disrespect the monarchy, choosing to wait for the king's direct permission [רש"י, חומת אנך, אלשיך]. Another perspective suggests their hesitation stemmed from a natural human fear. Knowing that people possess free will, they worried the king might strike them down with his sword if they emerged uninvited. They actually felt safer remaining inside the miraculous fire than risking death at the king's hands, and they only agreed to step out once they heard his soft, peaceful tone [מצודת דוד, אלשיך].
When they finally departed, their exit was calm and deliberate, completely devoid of panic. Up until the very second they were called, they had been casually walking directly on the burning coals, rather than seeking shelter in a cooler corner of the furnace [אלשיך]. Ultimately, only the three men emerged from the flames. The mysterious fourth figure the king had spotted remained inside the fire, as it was an angel of God [ביאור שטיינזלץ].