Read the original literary excerpt and the student's argument plan. Excerpt: "At the border inn, the doorway split Tomas in two: one boot in lamplight, one in the road's blue dark." Thesis: The story uses threshold imagery to portray exile as divided identity. Subclaim: Tomas's body is positioned between belonging and departure. Evidence selected by the student: "one boot in lamplight, one in the road's blue dark." Which commentary most precisely links the evidence to the argument's thesis?