Jesus turns a wild accusation into a lesson on spiritual warfare. Revealing that his battle was spiritual in nature. 

Jesus taught and preached with authority. He cast out demons because he had the authority to do so, and he is about to reveal his ultimate authority that only God has the right to do...

Jesus was faced time and time again with changing situations with the crowds around him. We can see two clear ways he handles them consistently. One is getting alone with His Father and two is changing his method.