- Objectively demonstrate that Brown advanced toward Wilson.
- Objectively demonstrate that Wilson was not angry at Brown.
You don't know what happened.
Without being there we can't, but we can surmise.
For instance, we have the radio call from Wilson seconds before the confrontation at the SUV, there is not anger or rage in his voice, he's apparently totally calm.
We also know that Brown was high, having 50% more THC in his blood that would indicate impairment, His adrenaline was likely pumping due to having a cop stop him shortly after he strong armed a shopkeeper. The odds are that it started as soon as he became aware of Wilson's vehicle, it heighten on it stopping and Wilson interacting with them to get them off the road. He would have felt relief as Wilson drove off, only to have new spikes flood him when the brakes came on, the vehicle stopped and the reversing lights came on shortly after.
So we have two people. One who has until this point shown himself to be an apparently calm and collected person, he doesn't appear to be expecting trouble, and as a decorated cop with a clean record and good reports, there seems to be no issues with him doing him job correctly. He is also sitting down.
On the other hand we have a kid who is high on THC, flooded with adrenaline, and has within the previous 15 minutes shown that he is willing to use his strength to bully his way out of a situation. He is currently standing.
Which of these two people is more likely to start a physical confrontation?