So it's dark, there is a thump on the car, Noor sees someone approaching his partner's side. It doesn't say in that report she was actually standing at the window talking to his partner, it says she approached the car.
So it sounds to me as if he was spooked.
That doesn't mean I think he should have shot her, but I have my doubts he would have bent around his partner to shoot a woman who was in the middle of a conversation with his partner. To me it would make more sense that he shot her as she went to talk to the partner & the partner, being closer & in a better position to see, was probably horrified as he could tell it was a woman out there.
The officer was far too hasty. For all he knew, if there had been a sexual assault, that could have been the victim running to them.
I still don't think it would be as likely to play out this way in Australia.