Hmm.  Younger poster on the forum starts a thread:  I keep seeing a guy outside my window.  He's there and then he's gone.  Tonight I watched him as he opened some kind of, um, portal, and went through.  I couldn't see anything else.  It's the arched gateway leading into the chapel across from my apartment.  It's so fucking creepy.  Every night he's been there, in a red rain jacket with some sort of dog following him.   They both go through.  I wonder where it goes. 

And enter Lauren. And possibly super secret sin eater FBI agent. There are traits that would indicate that it is a Changeling, archway, portal, ya ya.