685
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See, Zoro's opponent has to be a swordsman. Even if they weren't a swordsman before, they will become a swordsman once they have to fight Zoro.
I have no idea what Pica is thinking. I really thought Zoro was going to sense the real Pica inside the statue, and then cut through to him, but Pica made that completely unnecessary. He was basically invincible before, and he just suddenly decided he didn't want to be invincible anymore...