"There the workers of iniquity have fallen; They have been cast down and are not able to rise."
David is refering to the enemy as already defeated. We know that God threw the devil out of heaven, and we also know that God will cast those who have not repented into the lake of fire. When Jesus came and died he purchased the victory! The war has already been won, we just need to win as many battles and souls for Christ as we can!
-10th Grade Student