Write down "Have you heard the theory that rock-paper-scissors began in martial arts?"; it will matter more than it seems. It is a talky episode in the best sense: every exchange is a small duel, and nobody brought a shield. A thread left dangling since E58 gets tied off at last, neatly enough to make a librarian smile. Meet Ryu, who has the air of someone who will be very important or very dead. Solid work; snacks recommended.