Another angle on the bodysnatching alien story. The presence of human base was taken for a beginning of invasion by the indigenous lifeforms of this planet. After a time they attacked with silent deliberation. The humans knew nothing before half of them were under the creature's control. The lady is the second in command, last one alive, having just freed her captain from mind control through death. He had tried negotiation, against her advice, and failed. She had just initiated self-destruct, and is wondering for the few minutes left to her whether from the beginning there was any point to the resistance and whether she will cease to exist when she dies.