Mostly that the State of Illinois does not want any claim of "self-defense" to stand. And they will aggressively prosecute a marginal incident to make sure that it doesn't.
I imagine that the driver spoke to the police when he should have clammed up and waited for his lawyer.
Reaching into a car looks like a potentially lethal threat to me. I would vote for an acquittal, based on the information disclosed so far. Yes, that opinion could change.
I have had an angry driver get out of his SUV, open my door, and reach to pull me from my driver seat. I did not shoot him. I was considering how to break his arm against the steering wheel when he backed off. Must have been the ugly face I was making.
I closed the door, locked it, and waited for the red light to change. Then I drove off. Saved me a lot of trouble.
Too bad this driver had a window open. I drive with doors auto-locked, and windows closed these days.
I would hate to live wherever you live if you need to do that to feel safe.