Resident Evil 4/Final chapter

Go through the door and the last soldiers will be there. Take them out quick as there are only four or five of them. After defeating them, go left (if you go right you'll end up back in the lab). Then, go up the stairs and finally get the file and some ammo. Go through the door to find green herb, handgun ammo, shotgun ammo, and magmum ammo. After you have the ammo, go down the stairs and watch the cutscene. Afterwards, take out your handgun and shoot his leg and he will fall. To do some extra damage you may knife him before you stab him. If you have a rocket launcher, when he falls to the ground hit his eye with the rocket launcher and Ada might give you the special rocket launcher. It might take one more stab to the eye. After you stab him go near the bridge, but don't get on it. Wait until he gets near the barrel and shoot it. He'll fall to the ground. Stab him and go up to the second bridge but again, don't get on it. Go up the platform, press the Action button to hold the crank. Wait for him to come and pull, and he will be hit by iron bars. Jump down and stab him then go back where the barrel was and shoot his eyeball on his leg. Repeat shooting the eyeball on his leg and run around to avoid damage and go over iron bars at you so be ready to dodge. Soon Ada will throw the special rocket launcher back up. Shoot him to end the battle. If you kill him without using the special rocket launcher, then you can keep it and sell it for 30,000 Pesetas. After he's died, enjoy a cutscene and the island will explode soon so you have to get out quick!