Resident Evil 4/Final chapter

You are almost to end! Go through the door and the last soliders will be there, so take them out quick as there is only 4 or 5 of them. After defeating them, go left (if you go right you'll in up back in the lab). Then, go up the stairs and finally get the file and some ammo (not the last ammo). Go through the door to find green herb, handgun ammo, shotgun ammo, and mamum ammo. After you have the ammo, go down the stairs and watch the cutscene. Afterward, 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.