As the NY State report on police-on-police shootings I posted an article about elsewhere in the thread notes, rapidly turning your head to identify the source of a verbal command from a previoisly unseen police officer is the kind of thing that, to police, constitutes non-compliance and choosing to get in a fight with them. Even when you are an off-duty or plainclothes cop who has called for backup, and, much more likely if you are a Black or Latino out-of-uniform cop in that situation.