When Ally saw the whole setup she frowned.  She knew Niijima was up to no good!  How could bullies just rip apart the Newspaper room without teachers finding out?  Of course no one would rat out an entertaining fight like this.  When Kiro refused to fight Ally smiled and said, "Good."  The masters didn't teach him so he could entertain people who has nothing better to do.  They taught him to keep him safe.