Didn't happen in my game, but a manager/board member asked me a question after one of my games. He said that during one of his teams games (U10), his runner successfully stole second, but at the next pitch he took a lead off of second towards first. He said that he knew the pitcher and was trying to mess him up. I said that I can't think of an exact rule, and I later checked, saying that he couldn't do it, but he would have to make sure he touched second to go to third, and that he is not on a base so he is eligible to be put out. I also said that, had I been the BU, that I would just tell him to get back on the base because to me, that's unsportsmanlike conduct.
Thoughts?