In the chapter "Surface Tension", I killed the Barney who lets you into the ammo room in the building where there's a tank and soldiers stationed on the road beside the building. I didn't know that the same Barney is supposed to unlock the doors near the big gun in the area where the chopper is dropping militia. Is there a way around this? I've tried setting up HL to use the console previously, and yet I couldn't use sv_cheats or spawn any ammo at all. I also don't have a save that is near where I am currently, because my other save is in Blast Pit.