Final answer:
Boyne's description of Lieutenant Kotler's sudden departure following 'shouting' is an example of foreshadowing.
Step-by-step explanation:
Boyne's description of Lieutenant Kotler's sudden departure following 'shouting' about him between other and Father late at night is an example of the literary device known as foreshadowing. Foreshadowing is a technique used by authors to give subtle hints or clues about future events in the story. In this case, the mention of the 'shouting' suggests that Lieutenant Kotler's departure will have important consequences.
Learn more about Foreshadowing in literature