In A Separate Peace how does Brinker stage a "mock arrest" of Gene?What do Brinker's "war poems" reveal about him?

In Chapter 7, Brinker stages a "mock arrest" of Gene when the two boys enter the "Butt Room," the basement room in the dormitory where students gather to smoke. As they approach the door, Brinker seizes Gene's neck and pushes him into the Butt Room ahead of him, announcing,

"Here's your prisoner, gentlemen...I'm turning him over to the proper authorities."

Brinker had accosted Gene in his dorm room just previously, and had brought up the subject of Finny's accident. In the course of their exchange, Brinker had jokingly accused Gene of purposefully causing Finny to get hurt in order to have the room to himself. The banter had become strained, since Gene had himself been struggling with the question of whether his role in the accident had been intentional or not, and to change the subject, Gene gets up and states his intention to go to the Butt Room. Brinker, however, will not let the topic drop, and carries it forward, facetiously responding, "Yes, yes. To the dungeon with you." Once the two boys get there, Brinker enacts the "mock arrest," and the students lounging in the Butt Room then continue the interrogation.

Brinker's "war poems,"

"The War

Is a bore,"

and

"Our chore

Is the core

of the war,"

reveal his apathy and detachment towards the war. The war has not yet had a significant impact on his life other than that he has had to participate in an apple-picking excursion because the regular pickers are otherwise occupied with the war effort. Brinker has not yet had to face the reality of war directly, and his slightly cynical poetry reflects this fact, that the war has not, to this point, made any notable demands on him (Chapter 7).