Berry's issue is caused by playing football. He could live day to day with it for the rest of his life, but the flare ups are from playing the sport, thus it's the sport that is causing it. If he gets surgery to try and correct it, it is because of PLAYING football. (keyword: playing). So I'd imagine they could easily argue: an injury that happens from playing football at the highest level on planet Earth.
If he's just hanging out doing a 9 to 5 crap office job he would never feel it.
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