He wiped his head with water which was not what was left over after washing his hands (i.e. he wiped his head with clean water); then he washed his feet until he cleansed them.
أَنَّهُ رَأَى رَسُولَ اللَّهِ ﷺ فَذَكَرَ وُضُوءَهُ وَقَالَ وَمَسَحَ رَأْسَهُ بِمَاءٍ غَيْرِ فَضْلِ يَدَيْهِ وَغَسَلَ رِجْلَيْهِ حَتَّى أَنْقَاهُمَا