שמואל ב, פרק ט״ו, פסוק י״ג

A rebellion against the kingdom, carefully woven in absolute secrecy, finally reaches the point of no return. The hidden plot is already fully complete, and only after the horn is sounded and the uprising becomes an undeniable fact does the bitter news reach the king [מלבי״ם].

A messenger arrives from the field, bringing vital intelligence [ביאור שטיינזלץ]. The report he delivers is harsh and clear: Absalom has already declared himself king, and the masses are actively flocking to support him [ביאור שטיינזלץ, אברבנאל].

This update leaves no room for doubt about the new reality. Realizing that the nation has joined the revolt, David understands the full severity of the crisis, which immediately drives his dramatic decision to flee. His escape is designed to prevent him from being captured alive, but it is primarily motivated by his deep mercy for the city. By leaving, David ensures that Absalom will not strike Jerusalem with the sword while pursuing him [אברבנאל].