Ok I've been wondering about the battle with Miraak and the shout he uses during the battle to kill his allied dragons instantly, then he uses their souls to heal himself. He shouts out the dragon's name and then says "Ziil Los Dii Du". At first I though he was using a shout to kill these dragons instantly but then noticed he was speaking 4 words not 3. I looked up the word words and they roughly translate to "Spirit is mine devour". So was Miraak just somehow ordering these dragons to kill themselves...somehow?
I'm guessing he used Bend Will on the dragons and so they even follow his orders even if that order is to commit suicide? But near the end of the battle I notice Sahrotaar is actually attacking Miraak which would mean he isn't under his control so why would he die instantly? Is it possible to have a 4 word shout? Hopefully some of you might have a clue what exactly was going on.