The centurion, willing to save Paul; because Paul was a Roman citizen, whose death he durst not be accessory unto. It may be also, that this centurion, (if there were no more), as the Samaritan that was cleansed, did this in thankfulness unto Paul. Should cast themselves first into the sea, and get to land; that they might be helpful to others in getting on shore.
Related Commentaries of Acts 27:43
Acts 27:43
43 But the centurion, willing to save Paul, kept them from their purpose; and commanded that they which could swim should cast themselves first into the sea, and get to land: