Theory of the Shadow [SPOILERS.]

[hollowleviathan]

point out to me ANYWHERE within anything related to amnesia where the shadow appears and yells "I"LL GET YOU DANIEL! IF IT"S THE LAST THING I DO" it couldn't care less about daniel

It repeatedly infested and grew into areas which were not direct paths from where it had previously manifested towards where the orb(s) lay, but instead following Daniel. It's outside in the trees, it's blocking him at the beginning from progressing and grows away from the inner sanctum to impede his progress.