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Not necessarily a Plot Hole — a plot hole is when something happens but there's no valid explanation for it happening. In this case, while it isn't explained, there's nothing preventing it from making sense either; it's entirely possible that, for example, the death was sudden and/or unexpected and they didn't have the opportunity to react. Some parts of the game are left to the player's imagination.
Deleted line(s) 85 (click to see context) :
* PlotHole: The spirit willow dies, Seir shatters, then the spirits die. It is never explained why they didn't do anything before the willow died.