After completing the previous mission, Herr Strauss has one further client for you to collect on in the name of Thomas Downes. The mission begins once you reach his ranch and you’ll have to track him down quickly if you want the Gold Medal.
You’ll find him in with the crops to the east of the house and you’ll need to confront him. Opt to continually beat him to speed up the confrontation and following the outcome, you’ll ride back to the camp. Quickly head over to Strauss to complete the mission and hopefully obtain an easy Gold Medal.