The climax of Jehu's plan to eradicate Baal worship unfolds with precise timing, striking the exact moment a grand ritual concludes. Jehu deliberately waits until the sacrifice is fully completed before taking action. By allowing the ritual to finish, he ensures that the attendees' participation in idol worship is an undeniable, public fact. This calculated delay prevents any future accusations that innocent people were unjustly executed [מצודת דוד]. To maintain the deception leading up to this moment, it appears that Jehu himself takes an active role in the ceremony [ביאור שטיינזלץ].
The instant the offering ends, Jehu commands his armed forces to strike. He orders the foot soldiers who run before his chariot and the military commanders who lead them [מצודת ציון, ביאור שטיינזלץ] to enter the temple and kill every person present, leaving no survivors.
Following the slaughter, the soldiers execute a swift action of casting or throwing. There are two ways to understand this event. One approach takes the action literally, explaining that as the soldiers strike down the Baal worshippers inside the temple, they throw the dead bodies outside [רש"י, רלב"ג, ביאור שטיינזלץ]. Another perspective views this as an expression of great speed rather than a physical throw. According to this view, the soldiers do not throw anything. Instead, they propel themselves forward, rushing with intense haste to the inner sanctuary of the temple to smash its pillars and finish their mission [רד"ק, מצודת דוד].