YOU SAID:

the boy stood on the burning deck when all but he had fled

INTO JAPANESE

少年は、彼以外のすべてが逃げたときに燃えているデッキの上に立った

BACK INTO ENGLISH

The boy stood on a burning deck when everything except him fled

INTO JAPANESE

少年は彼以外のすべてが逃げたときに燃えるデッキの上に立った

BACK INTO ENGLISH

The boy stood on a burning deck when everything except him fled