spoilers:
How did the culprit of chapter 2 swing on the magnet and land without breaking a single bone? That's a critical fall right there.
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That's not the only one.
But considering even certains characters... specificities (Yeah, you know which ones ^^"), guess we can throw away a bit of our common sense from the start to enjoy the story as it goes ^^
Spoiler :
(Example for first line : We could question about how the culprit from C1 manage to move two whole doors, with the weight of a body added to one, without making any ruckus in the middle of the night (by stairs? elevator? not to mention the first door is larger due to the weapon piercing through it), all the while having lost his eyesight and with his overall "frail-looking" musculature, or at least compared to the "one-man-only-to-move-a-door" task at hand.)