here how i fix this ..sh*t.. on pc, after he takes the 3 dragon souls he disappear under the pool, i write TCL in console command (do not click on him) now travel down to where you come from (when you mount the dragon) TCL again to touch the ground ... theres a book (chapter 2) read it. you travel back, now return to the book travael again. and TCL go up to the fight area and its fixed !!! sorry for my bad english ;P