In line 27 ("So. But the . . . already"), the effect of the one-word sentence ("So") can be best described as an expression of the narrator's indifference to the boy's injury a departure from syntactical patterns that shifts the tone of the poem the continuation of an alliterative pattern that accentuates the sister’s grief a change in the narrator's perspective from despair to hope for the boy’s recovery the poem's turn from setting the stage for the accident to the accident's aftermath