Hello Linkoscuro457,
on the first pictures, I can see that you had robbed items in your car, which would make an attack legit. He may attack you to get the items/car for himself. However, I will ask the alleged harasser about his intentions/reasons, before making a decision.
Cheers,
UPDATE: I'm sorry but I can't punish him for doing this. He told me, that you tried to rob him which would make the kill totally legit.
Furthermore, even if you didn't try to rob him, chasing and killing you to get your stolen goods is a legit reason too.
note:For your future complaints, please get a video capturing software like fraps or obs. Screenshots as evidence are not that helpful tbh.
Cheers,
N.Chester