In my completely non professional opinion, the damage that you can't see from the impact is what might compromise the helmet. I don't know, just some scrapes, it should be ok. But when you fell you might not have realized that you hit your helmet on the ground because you were all of a sudden thrust into a new situation very quickly.
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But living an honest life - for that you need the truth. That's the other thing I learned that day, that the truth, however shocking or uncomfortable, leads to liberation and dignity. -Ricky Gervais
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