Some people are yelling get out, some are yelling get out of the car.
You can also see clearly from Mr. Ross's vantage point that Ms. Good is looking all the way away from him as she backs up and also turns the wheel all the way to the right. In other words, turning to get out of that situation and not towards any of the agents. You can also tell from the footage that the engine is revving at this time, indicating that the car is going to speed up, but at the same time this is all taking place at a very low rate of speed, close to 0, as she's doing what is obviously a 2-point turn.
At the same time that another agent appears to be lunging into the driver's side door in an effort to apparently turn the wheel to the left towards the agents. You can also see Ross switches his phone from his right hand to his left. That frees up his right hand to pull out his firearm.
But it's also clear that he never drops the phone and continues recording in his left hand while simultaneously taking his firearm out with his right hand and shoots at least twice. It also seems pretty clear that the reason he was arguably in front of the car was for video recording purposes, and that at any time he could have gotten out of the way.
And I will opine at this time that holding your cell phone in one hand while firing with the other seems pretty reckless, if not depraved indifference to human life.
