Arbiter of divinity disappears

So, finally got to this fight, got him to 2nd phase almost had him dead. And he just disappears from the arena and doesn't return

Edit: bug didn't happen during 2nd attempt, but the place where it happens is the part where you have to pick up orbs. Noticed during 2nd fight that he goes to the edge of the platform and says some shit, so im assuming in 1st fight he fell off the edge or something?