Thread:Omega138/@comment-34508844-20190607230239/@comment-34508844-20190607231041

But wait... Callahan is dead. Unless...

Holly used an alternate universe machine to open a portal to ABU, and is a character. Callahan is a monster in the universe Holly comes from and tells her to do experiments. She travels to Rin's universe and kidnaps her, performs experiments on her in secret, and makes Rin into a monster. Holly then, unleashes it upon the birds, with them knowing she made it, and whatever happens next.