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If the bystander truly was a retired police officer, then he was trained in both combat/defense and safe restraint. So I would think that, particularly for him, a pretty high standard should be levied with respect to whether his actions constituted manslaughter or contributed to a wrongful death....
Likewise, if he was a retired police officer it's likely that he used standard restraint procedures, and this freak death could not have been predicted.
 
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