When you come to the big door. You go down where all the weapons is and there is a fuel rod gun. Take it with you. When the door opend do you have to get 2 needlers. Shot all the guards and grunts. WHen you get the chanse you run at the right side so the prophet dont see you. come behind and shoot him with the fuel rod gun. You only have 4 shoots. Then press X beside him and punch him. If the guards comes jump off and run back to the door. Kill the guards. Run back to the prophet and press X beside him and do the same again and again!