Cops are well aware standing in front of a car gives them a free pass killing someone
This "technique" has been demonstrated enough that frankly, I think that any rational person would conclude that in any situation where a cop walks in front of your car, you're better off just gunning it before the cop has a chance to extrajudicially execute you first. If they walk in front of your car, it's clear they're just itching to murder you. The threat has been made, you should fear for your life. It's you or them.