Everyone had tried to tell him that there was no hope; Sayid had not been the same since the Man in Black brought him back, he may be physically there in body but was emotionally dead.

Yet Desmond saw that spark of Sayid’s old feelings for him as their eyes met once again, as Sayid knew he was unable to pull the trigger as the Man in Black had requested. In that moment, Desmond knew there was hope after all, that he would be able to get through to Sayid.