 Charlie begins experiencing the effects of heroin withdrawal , while Jack becomes trapped in a cave . Meanwhile , Sayid Jarrah ( Naveen Andrews ) , Kate Austen ( Evangeline Lilly ) and Boone Carlyle ( Ian Somerhalder ) attempt to triangulate the signal of the French woman 's broadcast . Charlie 's involvement in his band Drive Shaft is featured in the episode 's flashbacks . 
 Charlie <a href='uninflect' title='1'><mark>begins</mark></a> experiencing the effects of heroin withdrawal , while Jack <a href='uninflect' title='2'><mark>becomes</mark></a> trapped in a cave . Meanwhile , Sayid Jarrah ( Naveen Andrews ) , Kate Austen ( Evangeline Lilly ) and Boone Carlyle ( Ian Somerhalder ) attempt to triangulate the signal of the French woman <a href='null_genetive' title='3'><mark>'s</mark></a>broadcast . Charlie <a href='null_genetive' title='4'><mark>'s</mark></a>involvement in his band Drive Shaft is featured in the episode <a href='null_genetive' title='5'><mark>'s</mark></a>flashbacks . 
Charlie begin experiencing da effects of heroin withdrawal , while Jack become trapped in a cave . Meanwhile , Sayid Jarrah ( Naveen Andrews ) , Kate Austen ( Evangeline Lilly ) and Boone Carlyle ( Ian Somerhalder ) attempt to triangulate the signal of the French woman  broadcast . Charlie  involvement in his band Drive Shaft is featured in the episode  flashbacks .