I don't believe the allegation reported in the NY Post (by Jones' lawyer and an unnamed law enforcement person) that Szabo "shattered" the rear window of Jones' BMW.
It's very difficult to break a car window with your hands or fists. For example:
https://youtu.be/Ia23XWYdfbs
It can be done with a proper tool:
https://www.youtube.com/watch?v=6QCz4nXDq7w
I don't believe that Szabo broke the window even if he had been (tapping, knocking, banging-choose one) on it. Modern car windows simply don't break that easily. I also find it ridiculous to believe that Szabo just happened to have a window breaking tool on him or that he picked up a big rock and spontaneously decided to use it in order to get the attention of someone that he thought might be his Uber driver.
I don't know who broke the window or when it was broken.
The allegation that Szabo broke it sounds like a desperate attempt to justify what Jones did to Szabo. But even if Szabo did somehow break the window, then I still don't think it was a good reason to kill him.