Gone are 48 minutes of game time and fouls and whistles. Instead, he has to run a makeshift classroom. For a man used to directing traffic on a basketball court — and he is among the best to do it — Zarba now has a far more challenging problem. “They play the role of the players and coaches,” Zarba said. “Now they’re the ones complaining and arguing with me. You think I’d have some time off not working … They’re keeping me mentally focused.”