So I have made it all the way through the quest of At The Summit of Apocrypha with no problems except for the killing of Miraak. When his health gets low, he disappears somewhere else on the map that dragons and I can not reach. A dragon lands after he disappears and his soul goes to Miraak across the map but Miraak never returns to continue fighting. Ive tried for hours different ways of killing him but nothing works. He just disappears.. Now I am stuck. Any solutions?..