Heh... when they showed the preview during the first week of the show, I saw his chin (he was looking through binoculars) and went, "Hey! I think that's Michael Cerveris!" It is a very distinctive chin.
Now, mother always said that whenever you hear a strange, frightening, and potentially life-threatening ghostly chant coming from the dark woods that there's one thing that you should do: Not wake the others and go investigate it alone...