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Go out, do something else for 10 minutes, go back to the temple and re-do the fight. Laavtulon seems to be bugged this way - he doesn't take off when he's supposed to then the fight stalls when he's supposed to land but is already on the ground.
Edited by CaffeinatedMayhem on October 23, 2019 9:15PM
Same thing happened to me. Game didn't really freeze so much as the dragon just sat there and took no damage. Fortunately, traveling to a wayshrine and returning reset the quest and then completed correctly.
I'm stuck with invincible Laatvulon too, and nothing helps, not even quitting the game and coming back. He just sits on the ground and doesn't take any damage.
For me it was the Ra'khajin fight that kept becoming invincible. Took me eight tries, resetting to wayshrine and then happen to get lucky that damage still happen after he became immobile and I had loaded up on some DOTS that continued when it switched on the invincibility to new damage but the dots barely finished it.
Edit: yes I did a bug report, inb4 asked. Also between all the buggy mechanics and the annoying cat voices, not redoing this on other characters. This is a one and done DLC for me.
So from my expirience using stone fist bugs this fight. I'm sure there are other skills that cause it too, but I had to redo the quest 3 times. My friend whispered me and said it was stonefist that caused the fight to bug. Sure enough swapped off stonefist and the fight went fine