When Lu is waiting alone outside school to be picked up after almost all the other children are already gone, various adults -- all of whom she's met in some capacity before -- offer to take her home.
But she refuses.
She doesn't really know any of them, as she illustrates by asking herself questions about silly details of their lives.
Finally, in a visual surprise to the reader, Lu agrees to go with a punk teenager -- her brother.
This story illustrates the principle of a child going.