Theophylact of Ohrid

Struck by the miracle, the inhabitants of that city came out to Jesus, and having heard the details, they were even more frightened.

Commentary on Mark ↗

Titus of Bostra

The necessity of their loss, however, brought these men to the Saviour; for frequently when God makes men suffer loss in their possessions, he confers a benefit on their souls. Wherefore it goes on: And they came to Jesus, and see him that was tormented by the devil, &c. that is, at the feet of Him from whom he had obtained health; a man, whom before, not even chains could bind, clothed and in his right mind, though he used to be continually naked; and they were amazed; wherefore it says, And they were afraid.

Catena Aurea by Aquinas ↗