Blocking a parking spot/Breaking A Window

I just saw a post on another subreddit (crossposting not allowed) where a man is standing in a parking lot. He appears to be blocking a spot.

A woman is slowly backing her car into the spot. As she gets closer, the man turns his back to the car. She makes contact and keeps going very slowly. The man then elbows her back windshield; breaking it.

Now I'd very curious about who gets in trouble here? From a layman point of view he seems like he's in the wrong, but also I feel like hitting someone with your car no matter how slow probably isnt legal.

It just sparked curiosity in me and I'm interested in insight from professionals.

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