I figured it out last night, here is what to do:
Shoot all of the sacs/circle weak areas on the green eyes sides
after you have shot them all more of them will show up on his head, shoot them as well
after you shoot those it will turn into one big spot on his head and he will go completely apeshit and start charging like crazy, all you have to do is keep pounding away at the large spot on his head and he will die.
For all the smaller circles i used chain guns and than for the final big circle i used a chain gun rocket launcher combo.
Happy hunting This post has been edited by mlmadmax: Jan 14 2007, 06:42 PM