What according to aristotle's and Hobbes' theory would be the moral thing for the mayor to do in this case?

Imagine a small town occupied by enemy forces during a war. The resistance has been active in this town, and the leader of the occupying troops calls all of the townspeople together and announces that all men between the ages of fifteen and sixty-five are to be executed. In response to the pleas of the citizenry, he modifies his order and announces that he will permit most of the men to live on condition that the mayor choose three men from the town’s population and kill them himself, publicly, as an example to the others.