You don't know that for sure Ray. Remember, several reports have the cops saying the suspect was scared. They would know more than I because I was not privy to what he said to a lawyer or the cops.
And for all I know, those reports could be fake.
I’ve slowed down the video
https://www.youtube.com/watch?v=HiRWs-YgPwk
People are scattering prior to anything being swung at the car.
It appears to be a flag or possibly a paper sign that was swung at the rear of the car, not a baseball bat.