Question: I get that this may be an involved answer! They say the 2D beings are likely unaware of their presence, "because the cross-section is so small." But surely that doesn't really matter - a 3D person could be sliced in half by a wire the thickness of a hair, and they'd still be killed, so doesn't that apply to 2D being as well? They'll be leaving a trail of destruction in their wake, cutting buildings in half, etc., and none of them seem to care.
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