What happened to the Bru comrade in The Sympathizer?

In the novel "The Sympathizer" by Viet Thanh Nguyen, the Bru comrade is killed by the narrator and his U.S. Army Captain during a military operation. The Bru comrade was a member of the National Front for the Liberation of South Vietnam and was fighting against the U.S. Army during the Vietnam War. The narrator, who is a communist sympathizer, was working as a spy for the National Liberation Front and was tasked with providing intelligence to the communist forces. However, the narrator was also working with the U.S. Army as a consultant and translator, and during a military operation, he and his U.S. Army Captain executed the Bru comrade. The killing of the Bru comrade was a turning point for the narrator, as he began to question his loyalties and his place in the war.