A.T. Robertson Commentary Luke 19:33

"And as they were loosing the colt, the owners thereof said unto them, Why loose ye the colt?" — Luke 19:33 (ASV)

As they were loosing (λυοντων αυτων). Genitive absolute.

The owners thereof (ο κυριο αυτου). The same word κυριος used of the Lord Jesus in verse 31 (and 34) and which these "owners" would understand. See on Mt 21:3; Mr 11:3 for κυριος used by Jesus about himself with the expectation that these disciples would recognize him by that title as they did. The word in common use for the Roman emperor and in the LXX to translate the Hebrew Elohim (God).