Watch Across the Line for Free: How to Stream the Movie Online at 123Movies. . Out of the approximately 600 players in the National Hockey League, thirty are Black. Mattie Slaughter, a hockey phenom from the rural Black community of North Preston, wants to make it thirty-one. To reach his goal, Mattie needs to keep his nose clean and avoid trouble. Hard to do though, when you go to a school where racism taints every interaction, your older brother is a hustler and you’re crushing on a girl who’s already hooked up.