She may have parked just behind him and didn’t have time to back,up. These kinds of attacks are usually pretty swift.
If I’d been there, I would have tried to hit him with my vehicle.
Back in 1980, a drunk guy was trying to get in my car while his son “pushed against” the back of it to keep me immobilized.
The guy assumed I would not back over his son.
Guess what.
:)