The passage best exemplifies the rhetorical technique of repetition.
Repetition is the deliberate use of the same word or phrase multiple times in close proximity for emphasis or to create a specific effect. In this passage, the repetition of the phrase "Their eyes" emphasizes the scrutiny and judgment the neighbors are subjecting the narrator and their companions to. The repetition creates a sense of intensity and highlights the impact of the neighbors' gazes on the narrator's response.