In volume 1, when Zoro was imprisoned in Shells Town, There was a girl named Rika who gave him rice balls, or in Japanese, onigiri! I think that's where Zoro got his move: Onigiri!
No..he named it long before that..when Zoro used Onigiri vs Mihawk,,and mihawk was easily stopping it,,yosaku/johnny said something like this "no one ever stopping aniki's Onigiri before"
So, back when these 3 are together,,zoro already used that technique
