One 17-year-old student-athlete who went to Frisco Memorial with Metcalf, told the court that Anthony, 19, did not act in self-defense. That he kept his hands in his backpack until Metcalf shoved him, and then he responded by stabbing the teen in the chest. “That’s lethal force against non-lethal,” the witness explained. One of the key parts of Anthony’s defense, is the claim that Austin and his brother Hunter ganged up on Anthony, forcing him to take the knife out of his bag to defend himself.