I have seen people hit their head thru a wall without sustaining a concussion and its not even that rare to take lots of force on your head and not get damaged. The most danger lies in unnatural fast movements like when a boxer gets a punch to the chin at like 30kp/h and in his skull his brain bounces around hes gonna feel the typical symptoms of dizziness, unresponsive pupils etc.
Tldr: to sustain a concussion you would need to rapidly shake your head at speeds not achievable without outside influence
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