so im at the part where you go into the jail and kill the beast in armor and pull the lever. i ahve 2 mines for my mine gun, and 100 machine pistol rounds and no pistol ammo. i get 20 roudns for pistol right after that and 2 shotgun shells. this is no where near enough to get through the level. i am screwed, i dont knwo what i can do besides backtrack for anything i mightve missed..but even that might not not work. any suggestions?