The culprit forced Marcia to open the door to the driver's cart, then she was threatened to go into the room. When she was in, the culprit killed her from outside of the room with a ranged non-conventional weapon (can be a bow&arrow, a sling, a tazer, a very long non-weapon blunt object, etc.). He then rushily stepped in and closed the door behind him before killing the drivers with the same weapon.