Something is not sitting right with me about this. Something is missing. I read that he was pulling into the parking lot. Is it just possible that the worker had his back turned to where the cars pull in? Every one I see has ear plugs in to cut back the noise. Is it just possible that the guy was coming in a little too fast and/or a little too close to the worker? Is it just possible that the worker was turning and the stuff just happened to blow into the car?
If your husband slamed on the brakes and jumped out of the car yelling, is it just possible the worker was scared for his life? Who it first after the words where exchanged? If you husband hit first and the guy had is hands full with the blower, is it just possible he just reacted? Hit back with what he could? If your husbadn hit first, HE would be the one arrested. Is that why HE didn't call the cops?

I am not saying who was 100% right or wrong. I am just throwing out some thoughts.