sounds like a bad helmet, unless he was head and toe back flipping that will be beyond what some helmets can handle. 3 years ago crashed (being vary dumb for my age) and had an old hjc on that I was already going to replace because it was that old that the insides were that bad, didn't have a problem with it in the crash, popping up right away after it tell I realized I had broken stuff then layed back down. Had heard the the quality of hjc's had dropped, they changed the shape of the helmet that I didn't feel comfortable wearing them making sore spots on my head, so didn't by them again after that if that helps.
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