Enders and Anderson are told that, because evidence shows captured Navajos are always tortured to death to get the code, it cannot fall into enemy hands, implying that they are to kill their code talkers if capture is imminent.
It cannot fall into enemy hands. This was what Enders and Anderson are told. They are to kill their code talkers if capture is imminent. This was what Enders and Anderson are told. This is implying.