That was the scene here on Saturday midway through the second half between North Carolina and N.C. State. Suddenly the score didn’t matter. The game’s circumstances didn’t matter. All that mattered, then, was Terquavion Smith, the Wolfpack’s sophomore guard. He’d taken a hard fall after going up for a breakaway layup. Leaky Black, the Tar Heels’ senior forward, had tried to defend it — but in the process his arm came down on Smith’s face and neck, and Smith crashed to the floor without the ability to brace himself.