User blog comment:Inquisitor dusk/tyranids vs flood/@comment-2253300-20130226005901/@comment-5131965-20130226121839

actualy Cal, it would still be the hive mind, however in a physical manifestation, instead of a psycic force. the Grave mind is just the Hive minds realspace version.

And it wouldn't be tyralood (but nice idea i have to say), it would be Tyranids who spread the flood to Human worlds, who then turn the planet into raw biological matter for the Tyranids to consumer. and because the flood is a virus form, it simply gets picked up by the feeding hive ships, and the cycle continues