It sounds like Hemsky was dealing with issues with his vestibular system, judging from his post-concussion symptoms.
Bryce Salvador had a
detailed article on this a few years back after getting blasted with a slapper in the face
Quote:
The vestibular system runs on three tools: Your feet, eyes and inner-ear. If you lose one of those tools, your body can still function.
Lose two and you’re done playing professional sports. Period. When I was hit in the face with that slap shot the force caused an inner-ear concussion, so my feet and eyes took over and I was able to fake it. But somewhere along the way a different hit caused damage to my right eye. Now my two eyes were not communicating with one another and as a result my system short circuited.
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