Fortunate for our Law Enforcement folks, they are guided by principles far more realistic then ya'lls. Policies that put their lives, above the lives of rock throwing criminals. Which I have demonstrated repeatedly that the actions of the Agent in question did not violate any laws, rules or regulations.
The FBI has clear video of the event, and chances are this will be determined as a clean shoot. The real danger here is if political considerations scape goat this guy.