The morning after a grand feast brings a harsh awakening, replacing heavy drunkenness with paralyzing terror as a man discovers he narrowly escaped total destruction. Once the effects of the alcohol wear off and his mind clears [רש״י, מצודת דוד, רד״ק], his wife reveals the massive danger he had just faced. She explains that David and his armed men had been on their way to execute judgment against him, bringing a military force he had absolutely no ability to fight off [ביאור שטיינזלץ].
Hearing this news triggers a reaction of such extreme shock that he becomes entirely rigid, as if his heart has failed. Commentators explain that portraying him as turning to stone is a deliberate exaggeration to illustrate the sheer intensity of his panic [מצודת דוד, רלב״ג]. The root of this crushing anxiety is understood in a few ways. One approach suggests he is overcome with a mortal fear of David, terrified that the threat still hangs over his head and that David might yet arrive to attack him [מלבי״ם, מצודת דוד, ביאור שטיינזלץ]. Conversely, another perspective argues that his deep sadness and grief are actually over the massive, expensive gift his wife secretly gave to David behind his back [רש״י, רד״ק]. Blending these ideas, some explain that his collapse is the result of both the painful loss of his wealth and the overwhelming fear for his life [רלב״ג].
Physically, the sheer shock cools his blood [מלבי״ם] and shuts down his senses [מצודת דוד]. He is completely paralyzed by terror, leaving him in a state resembling death [רד״ק, ביאור שטיינזלץ]. This physical paralysis also serves a specific purpose: the shock renders him mute, ensuring he can no longer speak badly about David. At the same time, his soul experiences a hidden, inner sense that his actual death is rapidly approaching [חומת אנך].