Talk to General Greiner again. You should see an option to examine him closely. Do that and you would see that there is some essency thingy round his head. You will then get an option to try something to disrupt the essence. Do so, fight the spirit that appears and you should return Greiner to normal.
OK... I think the problem may be that I'm using a game that was already in progress... coz Hrrol's dialogue options changes as the game goes on. I've met with the Lord on Dhonal's Isle and now all I can say to Hrrol is "What are you doing to repair the school".
So if that's the case, the editor will only work 1st time you speak to him?
Anyway, appreciate your effort!