How does Henry's encounter with the dead man contradict his belief that Nature has "a deep aversion to tragedy"?

Nature is not the place of peace he believes it to be. His encounter with the corpse ultimately proves that Nature can be ugly and cruel and, moreover, indifferent to man. Nature's ambivalence is threatening to Henry. The uniform of the dead soldier, which used to be the blue of the Union army, has faded to green, the same color as the dragon from which he fled during battle. In this place of peace, Henry meets that same green animal of death.