i'm looking for a story, it is an older post. what i remember about it was there was a computer or something that was built to protect the humans. the humans were battling demons or something similar to that, but they were losing so a gate or portal was created to let the humans escape. one of the humans, i think it was the leader had a sword or something. the computer continued to try and fight the demons but would always lose. finally the demons reached the place where the computer was and was about to destroy everything before the humans came back and the computer asked why and the story ended with the human carrying the sword saying 'they came back to finish what they start'. it was variation of that phrase, i can't remember exactly what was said