YOU SAID:

He will not have been killing while he has not been played

INTO JAPANESE

彼がプレイされていない間、彼は殺しているわけではありません

BACK INTO ENGLISH

He's not killing while he's not being played

INTO JAPANESE

彼はプレイされていない間は殺しません

BACK INTO ENGLISH

he doesn't kill while not being played

INTO JAPANESE

彼はプレイされていない間は殺さない

BACK INTO ENGLISH

he doesn't kill while not being played