You can get a concussion without damaging your helmet.
I got a concussion in a car accident when some kids hit me: I was scratched up and bruised, but no injuries to my head - still had a concussion though.
Concussions come from your brain hitting the inside of the skull: Any change in movement of sufficient force might cause one.
I’ve not hit my head at all, helmet was not even scratched. I think it’s just brain blanking out high stress moments.
You can get a concussion without damaging your helmet.
I got a concussion in a car accident when some kids hit me: I was scratched up and bruised, but no injuries to my head - still had a concussion though.
Concussions come from your brain hitting the inside of the skull: Any change in movement of sufficient force might cause one.