If you've watched enough Celtics basketball, you've seen it happen. A player takes a hit to the head, stays down a beat too long, and the broadcast cuts to a stat line that just says "questionable — concussion protocol." No timetable. No easy answer. Just a wait. Celtics fans know that wait better than most. Back in 2016, Al Horford missed nine games with a concussion that, by his own account, turned into a genuine ordeal. The following season, he was back in the protocol again. In between, K...
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