Northern Hunter Not Dying

So. I just had an epic fight with the Northern Hunter on Dragon Age: Inquisition except...He's not dying. His stats say he has 1 HP left. He's still attacking, still doing damage, but still standing there at 1/XXXXX HP. Also, despite being far and away disengaged from him, the game wouldn't let me save because it said I was under attack. Kind of annoying. I have a video of him not dying.

https://www.youtube.com/watch?v=zUMdjCTA-Go&feature=youtu.be

Enjoy.