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From the text:

He had never recognized it before as a game of war.

“Attack!” The shout came from behind the small storehouse where play equipment was kept. Three children dashed forward, their imaginary weapons in firing position.
From the opposite side of the field came an opposing shout: “Counter-attack!” From their hiding places a horde of children—Jonas recognized Fiona in the group—emerged, running in a crouched position, firing across the field. Several of them stopped, grabbed their own shoulders and chests with exaggerated gestures, and pretended to be hit. They dropped to the ground and lay suppressing giggles.

Feelings surged within Jonas. He found himself walking forward into the field.

“You’re hit, Jonas!” Asher yelled from behind the tree. “Pow! You’re hit again!”
Jonas stood alone in the center of the field. Several of the children raised their heads and looked at him uneasily. The attacking armies slowed, emerged from their crouched positions, and watched to see what he was doing.
In his mind, Jonas saw again the face of the boy who had lain dying on a field and had begged him for water. He had a sudden choking feeling, as if it were difficult to breathe.

One of the children raised an imaginary rifle and made an attempt to destroy him with a firing noise. “Pssheeew!” Then they were all silent, standing awkwardly, and the only sound was the sound of Jonas’s shuddering breaths. He was struggling not to cry.