 The mandrakes prodded Hanson down from the roc and toward the new building, then left at a wave of the Sather Karf's hand.
They had a wave from Sather.
mnli hypothesis: They had a wave from Sather. premise:  The mandrakes prodded Hanson down from the roc and toward the new building, then left at a wave of the Sather Karf's hand.