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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Yep, had the exact same issue.
Can confirm that "defeating Coryphyspit too quickly" was the problem.
Re-loaded the auto-save made at some point (can't remember if it was the start or the half-way point) during the battle and deliberately took it easy on the old guy.
Got the cut-scene to trigger, and from there the end-game was a breeze.
