from what i can see of the tyre tread on the floor it looks like its rolled not slid, unless the bit i cant see it has slid.
i left my handbrake off the other day when i went to the bank as i walked away and locked the car it rolled back i s**t myself opened the door and slammed my foot on all the pedals hoping to get the brake, i looked round facing the rear of the car with one foot inside the car on the break and saw some guys laughing at me i couldnt help but laugh aswell.