Go to Donovan’s command center to trigger a cutscene and proceed with the story mission.
Head to the quarry to see if Enzo is willing to make a deal. Make sure that you’re fully prepared; ammo stocked, best weapons equipped, cash deposited, tac-vest equipped, and health and adrenaline shots full. Make sure you bring a good rifle or automatic weapon since you’ll be most likely fighting at medium or long range later on
Head to the marked location. The quarry will be empty for now so follow the mission marker and pick up the Vargas painting from the trailer office along the way. Take note of the gun locations for now; you’ll need them later. When you enter the building where Enzo is located, a cutscene will trigger. A whole lot of Marcano's men will arrive later on.