Okay, this is getting entirely too cryptic.
(spoiler)
You follow Klaus, you see him with a huge wolf, you backpedal out of there, no choices there. You get back to the lodge, get help and find the ritual circle, and the wolf finds you - this time you have a choice, you can either just run, or push your companion towards danger first, either way the wolf catches up to you and your companion from the event wakes you up.
Later on, during the lights out event, if you get to the lobby, you meet Dan, a neighboring wolf who came to check up on the lodge. Arvo comments that this wolf's silhouette is familiar. Dan then acknowledges he has already met Klaus - it was him in the woods in the part of the Klaus event that was real. That's what I'm talking about. What are you talking about? 
visit Dan with Klaus and he suggests performing some kind of a ritual with evocations in a low deep voice. Klaus wants there to be something beyond our realm so he strives to find it everywhere, this time through low frequencies of sound and our company in a cabin in the woods. he believes he can raise a curtain of this world and find something else, maybe he can even draw ghosts nearby and communicate with them. So during this unfamiliar experience Arvo starts to lose his mind, seeing things