and sauron , sitting in his black seat in the midst of the temple , had laughed when he heard the trumpets of ar-pharazon sounding for battle ; and again he had laughed when he heard the thunder of the storm ; and a third time , even as he laughed at his own thought , thinking what he would do now in the world , being rid of the edain for ever , he was taken in the midst of his mirth , and his seat and his temple fell into the abyss .