After caves and after the river with the guards on the hovercrafts, enter the next area and a cutscene will begin. As soon as the cutscene ends pull out your SVD sniper rifle and aim it at The End in his wheelchair. Before he gets taken away, shoot the guard in the head, then shoot The End in the head a few times. If done corectly The End will say something and explode. Later in the game when you get to the jungle where the fight was supposed to be, you wont have to fight him and the jungle will be filled with guards from the Ocelot unit.