John Chrysostom

"Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord." But observe, how they do not linger there, as (they might have been tempted to do) now that the proconsul was a believer, nor are enervated by being courted and honored, but immediately keep on with their work, and set out for the country on the opposite coast.

Homily on Acts 28 ↗

Theophylact of Ohrid

"Turning here and there, he sought a guide." This is proof of his blindness. It was necessary through precisely such a punishment to bring to his senses the one who had previously been carried away by magic. In this way, punishments served, as it were, to bring even the sorcerers to their senses.

Commentary on Acts ↗