Luke 10:17-18 (KJV) "And the seventy returned again with joy, saying, Lord, even the devils are subject unto us through thy name. 18 And he said unto them, I beheld Satan as lightning fall from heaven."
What was Jesus doing while they were going through the valley from village to village casting out devils? Jesus was on the mountain pulling down those facilitators of wickedness in high places. When we see those higher-up devils being shaken, we know that the little ones will have to scatter.
That's why Jesus said, "This kind can come out only by prayer." (Mark 9:29) Through prayer we can pull down the principality who is controlling the demon who is possessing or oppressing the person. Then it is quite easy to run that little devil off!
