You hand is not a bus. It doesn’t have the mass or speed and certainly not the combined force of the bus.
People assume that these things scale perfectly, that is because you hand is as large as a bug compared to a fly as a bug is to you that the impact would be the same, but that isn’t how physics works at all and they are completely different. Things don’t scale like that. It’s why there a size limit to how small a warmblooded animal can be and to how large an animal can be before it crushes itself to death, because the physics simply do not scale.
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