Before revision: Hartmann, in his book which describes his actions, states that once in 1988 he was walking with his girlfriend and due to many cars parked on the side-walk , they had to continuously zigzag between the cars so he decided to walk straightforward above the cars.
After revision: Hartmann, in his book which describes his actions, states that once in 1988 he was walking with his girlfriend and due to many cars parked on the sidewalk , they had to continuously zigzag between the cars so he decided to walk straightforward above the cars.