At night, outside, Kurtz's Cambodian followers prepare to sacrifice a water buffalo. At the same time, Willard prepares to kill Kurtz. He says that "the jungle" wants Kurtz dead, since "that's who Kurtz took his orders from anyway."
In a stunning visual, Willard's head slowly emerges from the river, face painted in camo colors, looking like the silent assassin he is.
He grabs a guard who's protecting Kurtz, dragging him into the darkness. (Maybe Willard kills him?)
He sneaks up behind Kurtz, who's in the process of making a radio transmission.
He hacks Kurtz with a farm implement at the same time that Kurtz's followers are killing the water buffalo in the same way.
As Kurtz lies dying, he utters his final words, "The horror…the horror."
Outside, the people continue cutting up the meat from the sacrifice.
Willard steps out of Kurtz's room and looks at a manuscript Kurtz has been writing. He sees that Kurtz has scribbled the words on one page, "Drop the bomb. Exterminate them all."
The Cambodians look at him, but don't make a move to hurt him as he walks out, holding the manuscript and the weapon he used to kill Kurtz.
They stare at one another for a while before Willard walks down the steps. They move out of his way as he walks through the crowd, putting down their weapons.
Willard pulls Lance out of the group and they both board the boat and leave.
The rain washes them as the radio babbles with the voices of the soldiers whom Chef tried to radio. Willard switches off the radio.
As the rain falls, they set out through the dark and fog, heading downriver.
We hear the echo of Kurtz's final words once more—"The horror…the horror"—superimposed on a close-up of Willard's camo-painted face.