Ok, here's my view on the "Scary Thing". I think it's when they show all of the Halo systems launching their activating shots to the arc, the arc then controls the shots and uses the ring systems to launch the devastating attack, to starve the flood. Or it could just have something to do with the Gravemind... Who [i]is[/i] the Gravemind anyway. I know what he looks like, I just want to know who he is...