Gregory the Dialogist

But he who is freed from the power of the evil spirit is thought to be dead; for whosoever has already subdued earthly desires, puts to death within himself his carnal mode of life, and appears to the world as a dead man, and many look upon him as dead; for they who know not how to live after the Spirit, think that he who does not follow after carnal pleasures is altogether dead.

Catena Aurea by Aquinas ↗

Bede

And crying out and greatly convulsing him, it came out of him. The unclean spirit, about to depart from the man, convulses him, and terrifies the onlookers with a frantic cry. For often the devil, while being expelled from the heart, generates sharper temptations in it than he had previously stirred up when he possessed it quietly.

On the Gospel of Mark ↗