Filleting Cut

Nemuno Sakata's Focus Shot (a Touhou LW original). She swings her cleaver imbued with lightning to unleash three shock waves toward her target. It is unknown whether or not Nemuno uses this same technique to fillet the fish she catches from the river. You may think that you only need two cuts parallel to the spine to fillet a fish, but the third cut is needed to remove the head and the internal organs. How terrifying!