My Game crashed during the Trialmaster fight.

I was playing the trialmaster fight, got to about 20% of his health left. Then he did a time freeze but never unfroze time. I could open my inventory, options, etc, and my character was charging a bonestorm at the time, oddly I could still aim the bones around to different places, but time never unfroze and I had to ALT + F4 out of the game, losing the resources I used to enter the trialmaster fight.

It was the first time I had done the fight and I'm really dissapointed.