Life always prospers in most unusual places…
The Yondaime Hokage finished the last handseal of the Summoning of Death God and the bony fingers protruded from this back and into the battlefield, taking away the soul of the demon Fox, entangled in his wife's chains.
As he put a shard of himself within the seal in young Naruto's mindscape, he guiltily noticed several ghostly humanish fellow-shinobi-look-alikes getting torn to shreds, distracting the demon fox just enough that sealing it was not as much of a problem as it could be. As their collective "blood" slowly floated out of the beast's cage, it was howling in malice of the restrained predator. And the waters in Naruto's inner mind changed color.
The last thought Minato had before disappearing on to the final destination was "I sincerely hope it does not affect Naruto adversely…" Than a spiritual facepalm was heard and a muttering about taunting fate. And then, it was quiet. Iniside the waters, the disjointed spiritual particles began to form into groups… into the net… into the strange construct not meant to be seen by Men…