When you begin the final battle with General Crowe, make sure you have a lot of
grenades and the assault rifle with the grenade launcher equipped. General Crowe
will not fight person to person yet. For now, focus on the monsters jumping
around. Note: Do not fire the helicopter's rocket launcher. You will need it for when
you fight Crowe. Also, use the helicopter to shield yourself from Crowe's machine
gun fire. Using the grenades with perfect accuracy, kill the monsters. Get two of
them at the same time if possible to save grenade rounds. At some point they will
stop dropping down. When this happens, focus on Crowe. After some time of
shooting at him, he will jump down and fight you person to person. Avoid his
machine gun, as it takes a lot of your health away. It is recommended that you
use the speed ability to dodge bullets and hide behind objects to regenerate
health. When Crowe gets in front of the door, use the helicopter's rockets. Once
Crowe is dead, it is just a walk to the end.