Aeneas didn’t stoop to killing fugitives, nor those he met on foot nor horsemen holding lances. Through clouds of dust he tracked only one man, his challenge was for one alone: Turnus.
Fugitives = refugees
(but these are soldiers retreating on the battlefield)
This recalls Aeneas' earlier declaration to the general people that they were not his enemy, only their leader.
He goes against that by attacking the undefended city just to draw out one man.
