Brainwashing Session
Just like Fa Tai, each one of Kraft's new victims had had haughty thoughts towards Jin, before Kraft 'convinced' them to think otherwise. Jin, who had survived to tell the tale, knew what a terrible torture each one of them had to go through.
Still, Kraft had merely shown Jin a fraction of the pain and anxiety the key personnel had gone through. He had not had such fun for a long time and took this as an opportunity to refresh his skills and try out new tactics to scare the key personnel.
His methods had varied from plain boring overwhelming darkness to digging out their worst fears and portraying it out for them to relive it over and over again. However, that was just part one. The next phase of brainwashing them was to make them believe they still had hope in that everlasting darkness to cling on.