The four and twenty elders fall down before him that sat on the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying,
Fall - immediately. 'Shall fall down:' this ascription of praise shall be repeated onward to eternity. So 'shall worship ... shall cast their crowns,' in acknowledgment that they owe their crowns (not kingly diadems, but crowns of conquerors) wholly to Him.