Sayid Jarrah ( Naveen Andrews ) , Kate Austen ( Evangeline Lilly ) and Boone Carlyle ( Ian Somerhalder ) attempt to find where the French transmission is coming from , so they make a plan to turn on antennas at different points on the island in an attempt to triangulate the signal . At the caves , Charlie search through Jack Shephard 's ( Matthew Fox ) medicine supply for something to ease his heroin withdrawal . When Jack catch him , Charlie say he have a headache and want aspirin .