but even allowing for speed and compression , there seem to be essential differences from b and c. thus in this outline ( e ) elwing , as it appears , comes to sirion at a later point in the story , after the departure of tuor ; but the raid and capture of elwing seems to take place at an earlier point , while earendel is on his way back to sirion from his shipwreck in the north ( not , as in b and c , while he is on the great voyage in wingilot that took him to kor ) .