"And he wiped over his Khuffs," but Mansur did not mention the wiping.

Meaning, in this route, since Shu'bah narrated it from both Sulaiman and Mansur.
Sunan an-Nasa'i Book 1, Hadith 28
← Previous Hadith "I heard Abu Wa'il (say) that Hudhaifah said: 'The Messenger of Allah (ﷺ) came to some people's garbage dump and urinated while standing.'"

Sunan an-Nasa'i Book 1, Hadith 27 Next Hadith → "Whoever tells you that the Messenger of Allah (ﷺ) urinated standing up, do not believe him, for he would not urinate except while squatting."

Sunan an-Nasa'i Book 1, Hadith 29