Yeah, that part is indeed a bit tricky, and the fact that you ate the mushroom actually has nothing to do with it. It simply unlocked the scene with Deborah. You could have missed the mushroom entirely or thrown it away and still made progress (just without accessing the scene with Deborah).
Basically, you needed to try the three windows and then make your way to the back of the building. At that point, the scene—although slightly different depending on whether Deborah helps you or not—leads to the same outcome: the path is too dangerous due to stormwater puddles and exposed electrical cables from a fallen utility pole. So it's better to turn back and return later with the proper tools. (Without Deborah, all you need to do is throw a rock at the fallen power pole to see that it's live, realize the danger, and retreat. But of course, the scene is more complete and enjoyable with Deborah—especially if you like her—since it offers more content and provides deeper insights into the world and story.
But yes, I agree—it’s a bit tricky, which is why, alongside Chapter 3, I’m also working on an
in-game walkthrough that retroactively covers Chapters 1 and 2. It'll be available via a skill (which players can choose to start with) and will provide real-time guidance during moments like this, so players aren't left entirely on their own.
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