Reaction:
Before a Battle action resolves taken by a player who controls only Cavalry and/or Naval units at the current battlefield, if it is the first action he has taken this battle: Negate its effects.
"You should have accepted my offer, Kuon-san," Daigotsu said, shattering the Crab's dai tsuchi. Kuon took a long look into the Lord of the Shadowlands' eyes, and realized what he faced. He sounded the retreat.