Long story short, I got boxed in by a car behind me who is 2/3 inside a 1P zone and 1/3 in a no stopping zone. Upon nudging my way out, I accidentally reversed into that car with no visible damage and about 2mm indent on the bumper bar. My car has a thin line of scrapped paint only visible if you look at reading distance. So question is: Is a car that is 1/3 in a no stopping zone considered to be parked legally? Who is at fault in this case, or is both party considered to be contributory negligent.