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This is, for many reasons, a fascinating story. It’s the trigger for discussions ranging from medical/duty of care failure to legal/policy issues. According to US doctors, #Karius is #concussed in this incident, shortly before the 1st of his huge errors. Brief thoughts follow...
First, a too-common reaction is “What a lame excuse, he’s clearly not concussed”, because it doesn’t look like they expect it to. And, hey, you all know I value sound skepticism! But the thing about concussion is that only about 50% of them show present with any of these signs: 
So…that leaves about 50% that DON'T obviously look like concussion - no loss of consciousness, no ataxia, no dizziness, no confusion etc. Heck, some only present as symptomatic after matches are completed! So dismissing it based on what you saw on video, probably not ideal
