This problem has been fixed here. At least if you're on PC (you didn't specify)
In general:
1: Switch to mouse and keyboard if you aren't using it already.
2: Make a save (a full save) before starting the fight.
3: Exit the game, and click "repair game" in Origin.
I have played through the battle a dozens times and keep getting frozen no matter how far back I start my saves!
I haven't been playing with a gamepad at all - I don't even have one so fixing mouse/keyboard settings isn't an option.
I've done clean saves and repairs every time I re-try and nothing is changing.
Is there any solution short of going out and BUYING a GAMEPAD on the slim chance that it changes something?!!
