Curious question about shopping centre carparks

[SEZ213]

After watching a merc reverse into a carpark today only to clip the rear end of a falcon stationwagon on her way in...I came to ponder the question regarding the legalities of actually reversing into a 90 degree car park.

The merc had reversed out of another carpark, and decided to reverse park into another directly behind the stationwagon (not sure what was going through her head, she was reversing the wrong way up a one way road)...the station wagon driver only stopped reversing because I yelled at him, but failed to understand the other half's hand motions of 'pull back in' and the merc subsequently hit hit rear bumper.

Now as I understand it, the reversing vehicle should be looking where they're going...in this case neither was, but it did make me question whether reversing into a car park in a shopping centre, is actually frowned upon because people have an inherent ability to focus behind them, as opposed to what's in front of them when they are reversing into said car park...

I watched her try to explain to the docile man what she was trying to do, but as she was reversing, she failed to take into consideration the front end of her car...my assumption is she would be in the wrong, as he was stationary when she hit him...but I'm wondering if maybe that's not right...?