At the part on Detour where there's a some ramps, and around the corner a blast door behind some fallen rocks with a tipped over and seemingly broken control button. I push it and nothing happens. Nearby there is a little room with a guy in it who says he's "on your side" and that "they're ambushing miners," who then apparently suffers a heart attack because he just keels over and dies in mid sentence. Is there a broken script here or something? How do I get past this part?