All right. Heh, this is for the person who runs out of ammo and bombs before IT dies.
After the cutscene, run around the rock, picking up the items. Run into the First gate,
close it.
If you have ammo for the rifle, mine-seeker, or shotgun, aim at the red barrel.
Wait until he comes around the rock, then shoot it.
Run the the other gate, as he will now break the one you are behind.
Run out and close it, wait again, then shoot the barrel if you have ammo.
If not, run around the rock.
At this point, you may feel like you are going to die.
Not so, as your knife is very effective. Wait for him to go underground, dogin his
attacks. When he comes back up, run behind him and slash his rear.
Continue this, and it should be over pretty easily.
I have been able to make this work 3 times without ammo.