Darian moves into a safe position, across the street, where he can easily observe. Unfortunately, as both guards remain inside the small shack, the only way to get into melee range with them would be to open the door; an act they would instantly notice. However, a good distraction (DC 15 Bluff check from either of them) would likely be enough to draw at least one guard out of the shack to investigate, opening them up to a surprise assault.