[dropcap]L[/dropcap]ike many times before in practice, Hays High football player Marcos Barrera knew his role when “F-right” was called in an October 2014 game at Anderson High.

As an offensive lineman, Barerra’s job was to block down and help set up a lane for his running back.

What seemed like an exercise in the routine turned into a nightmare scenario.

“I was blocking down and then I remember hearing a snap in my leg,” Barrera said. “I then couldn’t g...