- last post: 01.01.0001 12:00 AM PDT
Gravemind is Flood, and he can teleport. High Charity is Forerunner, thus it has its own teleportation grid. The Flood are intelligient by stealing whatever knowledge its hosts has. Even with the Forerunner Ship gone, High Charity could still have reserved power(ex: You disconnect a charger from your cell phone. Even if it's not fully charged, there's still power). If High Charity's power is completely gone, then the Forerunner city would be in blackout and/or there's a possibility High Charity will crash on Halo. If Cortana falls to the Gravemind, then she can sure improvise as she has a tendency to do so.