The forerunners were studying the flood on the Halo rings correct? Now as we all know, the flood can communicate with other flood over extremely long distances through various techniques, including pheromones, and some kind of esp ability, which if I had to guess was some kind of Em sign al.
So here is my question.
Seeing as the flood could communicate with each other and draw other flood towards them, wouldn't having flood on the rings be a huge security risk? I mean, during the Flood/Forerunner War, the flood could have easily captured a halo ring, and stopped it from firing if they knew where it was, so why did the Forerunners do this?