(b) The provisions of subsection (a) of this section do not apply to a performer engaged in a professional exhibition or a person or persons engaged in an activity authorized under section twenty of this article.
(c) No person shall operate or manipulate any vessel, tow rope or other device by which the direction or location of water skis, surfboard or similar device may be affected or controlled in such a way as to cause water skis, surfboard or similar device, or any person thereon to collide with or strike against any object or person.