From what details we have, it looks like the car was in a parking space, the cop opens a car door, driver puts car into reverse, car backs up with open door hooking the cop, threatening to send him under the open door and under a wheel.
Are we to think that camera system is fake and they've turned, instead, to armed offduty cops to shoot selected customers?
Without the videos i won't believe anything the sheriff's office says.
Let me put it this way, having been on a jury, if those videos are good enough for the jury, then by gum, let's see 'em! Anybody can tell a story ~ digital is forever!