Overview: The leader of the Bloodsail Pirate Gang, Willy McCoy, was once an Imperial officer with the strength of a Great Knight. He mastered the Imperial military swordsmanship, Black Shark Breathing Technique, and an unknown form of boxing, and he was skilled with a Knight's Longsword, rapier, and Finger Tiger.
Due to his ability to resolve most conflicts with a pair of iron Finger Tigers alone, and his capability to punch straight through the chest and abdomen of a fully armored official knight with one punch, he was known as 'Bloody Hand Willy'!
(Note: His close combat prowess is extremely strong, and if detected, it is strongly advised to avoid him.)
Finger Tiger?
Rein knew about that. Typically consisting of four connected iron rings, the back of a Finger Tiger features a semi-circular iron hoop that is held in the palm of the hand, while the four rings fit over the index, middle, ring, and little fingers respectively.