When they are jumped by outlaws, they manage to win the ensuing fight. Duggans earns $250 for killing the leader of the gang. By now, he's in love with a saloon girl, so he needs money to provide for her. He and Luther decide to try their hand at bounty hunting. And Duggans is fully intending to be a lawful bounty hunter. He'll bring his prey in alive whenever possible, killing only when forced to do so.
There's some good dialogue in the film as well, such as this example: