I suspect that he, somehow, how is unclear to me, fell through the floor, since i see stones from the inside from time to time when he is supposed to be talking. My solution: i just force-crashed inquisition via my good old task manager and will restart the mission soon (after completing some operaitons though. I was foolish enough not to check the wiki first for missions that become unavailable after this).
EDIT: Found a solution. Problem is, he died. Solution is to bring a mage capable of resurrecting him to the mission. Then just, well, resurrect him. This will probably help anyone except me, since he, as i mentioned above, fell through the floor. I'll try to resurrect different empty parts of the area now, wish me luck.
