You see videos like this and you wonder why alot of people hate and fear police. This guy purposely turns off his dash-cam but didn't do it right.
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It is 100% irrelevant that the man has dementia. When the officer is placed in than situation he needs to protect himself and constrain the person. Just because somebody is mentally I'll doesn't make them any less of a threat to the officer and without any audio we have no idea whether the witness informed the officer of the man's condition and what the officer said.

wheres the audio? I'm guessing "Hold it right there!" was said in the first couple of seconds, after that, what was the cop supposed to do?
It is 100% irrelevant that the man has dementia. When the officer is placed in than situation he needs to protect himself and constrain the person. Just because somebody is mentally I'll doesn't make them any less of a threat to the officer and without any audio we have no idea whether the witness informed the officer of the man's condition and what the officer said.