During the battle of Windhelm, after I make it into Ulfric's palace, Tullius and Rikke proceed to the throne and the dialogue happens as it should.
However, when Galmar tries to attack me, Tullius and Rikke just stand there, swords drawn doing nothing. Galmar and Ulfric ignore them.
In addition, Galmar can't die, he just kneels, gets back up, and slowly walks to the throne as if nothing has happened.
Finally, when Ulfric kneels, he says nothing, and Tullius and Rikke still ignore him.
What can I do to fix this odd behavior, especially by Tullius and Rikke? I tried "ice forming" them, stabbing them, restarting and trying the city battle again, and beating them senseless as a werewolf, but nothing works.