They're sitting in the woods, sharpening their knife on a rock, taking a break from the slender mansion and all Jeff's fucking drama when they see a drawing on the tree next to them. They give it a weird look and then get up to examine it, a paper with the proxy symbol, just another person trying to summon them as if that isn't a bad Idea. And then they hear rusting. They pick up their knife and look around the woods until they find the culprit, and then they just stare at them, trying to stay hidden.