The Skull Faces only had a head and torso left, and no significant damage was dealt to its core. But its HP was shaved vigorously whenever the scarlet electric shock ran from the blade of the katana. The additional damage from the lighting attribute occurred because of the weak electric shocks that ran through the monster’s body, and its HP could be shaved without directly hitting its core. It was effective against a monster that couldn’t be damaged in other parts except for its core, such as a Skull Face. That was one of the reasons that Shin chose to use 『Red Chidori』, too.