Bugged Corypheus Fight
So, my game keeps having the same problem at the same time. I'm fighting Corypheus get to like the third platform or whatever it is right before the first supply create. I fight him there get him to ...
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I had exactly the same issue. Twice in a row. When googling about it, I saw a tip that it happens if the PC hurts him too much too fast just before the cutscene - and sure enough, when I tried it a third time and just hit him with normal attacks during that stage, it worked fine.
Here's the YouTube-clip with the comment I mentioned ("Apparently if you lower his health too fast in that section of the fight against him it glitches like that."):
OT, the boss fight in Dragonborn for Skyrim has the same issue - if his health is lowered too fast, it messes up the scripted fight.
