How did Jesus demonstrate power over the demon?

Answer

For some reason, the ancients believed that many demons would choose to possess the same victim, rather than achieving their objectives fmore efficiently by possessing as many victims as there were demons. In the dramatic story in Mark chapter 5, of the demoniac who was possessed by a legion of demons, Jesus demonstrated his power by casting them out into swine. The presence of so many demons at once seems to be intended to show Jesus' absolute power over the demons.