I ran into the same problem that a previous commenter had with the big boss. I died and then he was gone. I tried running through that whole area again to see if it would trigger him but I was left stranded and couldn't cross the bridge. If there's any chance you can fix it, I will run through the whole game again to get the ending for my video. It's 330am over here right now so I won't be editing my vid until later in the day when I wake up. Badass game though besides that glitch. It definitely makes you work to stay alive in some spots.