When the Precursors unleashed the Flood on the prehistoric humans, they passed a test and the Flood chose not to infect them, according to the Primordial. What is this test and why did the Forerunners not pass it?
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In the original Trilogy Bungie vaguely hinted the Precursors may have been responsible for the Flood. The Precursors were millions of years older than the Forerunners, capable of traveling to other galaxies and tinkering with the evolution of other life forms. They also supposedly achieved something called trans-sentience; a new level of consciousness, unified, maybe even immortal. Sound familiar? The Gravemind spouts a bunch of this at the Chief to try and stop him from rescuing Cortana and blowing up the Ark.The idea that the Flood is the Precursors or the Flood itself is a type of twisted test is just a bit much. It would make more sense if the Flood was a experiment gone horribly wrong by a group of wacked Precursors and not a psychotic test meant to prove what species should have dominion over the galaxy. [Edited on 12.02.2012 10:36 PM PST]