he knows damned well that jake chambers was n't there on the day of his accident , nor roland deschain , either-the idea 's laughable , they 're make-believe , for christ 's sake-but he also knows that at some point the song he hears when he sits at his fancy macintosh writing-machine became jake 's death-song , and to ignore that would have been to lose touch with ves'-ka gan entirely , and he must not do that .