> The reason why the Flood survived the initial activation of the Halo Array is two-fold. One is, as mentioned, samples of the Flood were kept on the Halos for research purposes. The Halos were always meant to be a last-resort taking-you-with-me weapon. Even up until the activation of the Array, the Forerunners were intent on finding a less catastrophic way of defeating the Flood.
Secondly, the Array was never meant to kill the Flood. Simply, it *can't*. The smallest parts of the Flood are the Flood supercells and spores. While the Array may be able to destroy the supercells since they are…