I have gotten to the Boss fight with Miraak several times and can not complete it. Whenever he gets down to 1/4 health, he runs to this pool in the center of the platform and becomes transparent. He cannot be attacked. Sometimes I can kill the dragons he has flying around, sometimes I can't, but nothing else changes. I read in a forum that there are supposed to be three dragons during the fight but only two show up. Even if they are dead he does not leave the pool and I still can't finish the fight. It doesn't make any difference if I am on the ground, or riding my dragon. Anybody know about this?