ثُمَّ يَنْحَطُّ نَحْوَ الْمَرْوَةِ، وَيَمْشِي عَلَى هَيْئَتِهِ، فَإِذَا بَلَغَ إِلَى بَطْنِ الْوَادِي سَعَى بَيْنَ الْمِيلَيْنِ الْأَخْضَرَيْنِ سَعْيًا حَتَّى يَأْتِيَ الْمَرْوَةَ، فَيَصْعَدُ عَلَيْهَا، وَيَفْعَلُ كَمَا فَعَلَ عَلَى الصَّفَا، وَهَذَا شَوْطٌ.
Translation: He descends toward Marwa and walks normally; on reaching the valley bed, he moves briskly between the two green markers until proceeding to Marwa. There he ascends and repeats what he did at Safa. This counts as one traversal.
The text distinguishes ordinary walking from a brisker pace in the marked zone. For men, this corresponds to harwalah; it is not a direction to run over the entire route.
The phrase wa-hādhā shawṭun is decisive: Safa to Marwa counts as one traversal, not half a traversal.