Yesterday, as many respectfully cheered on the marathon participants, a skateboarder ran directly into a wheelchair racer in Park Slope. Was it intentional? Witnesses say it was. From this Flickr thread:He came riding in from the side and didn't even try to stop himself. As soon as he stood up, he was smirking and after the NYPD yelled at him, when he retrieved his skateboard and walked up the block towards where I was standing,......