““I felt that something horrible was near from the moment that my foot first touched the water,' said Frodo. 'What was that thing, or were there many of them?' 'I do not know,' answered Gandalf; 'but the arms were all guided by one purpose. Something has crept, or has been driven out of dark waters under the mountains. There are older and fouler things than Orcs in the deep places of the world.' He did not speak aloud his thought that whatever it was that dwelt in the lake, it had seized upon Frodo first among all the Company.””
