Whirlwind Iron Cutting Fist (旋風鉄斬拳, Senpū Tetsuzan-ken; Viz: Fist of Whirling Wind, Slashing Steel) is a martial art taught by Master Bomb.
The Whirlwind Iron Cutting Fist martial art revolves around manipulating the air to create razor-sharp whirlwind pressures that slice a user's target. The user then pushes the pieces of the target with varying degrees of force depending on the proximity to the eye of the whirlwind. The cutting pressure can also be implemented into a user's kicks and is sharp enough to cut through stone. Use of this martial art also creates noticable a pinkish-red aura, similar to the light blue aura of Water Stream Rock Smashing Fist.
Users of Whirlwind Iron Cutting Fist adopt different forms for different attacks. For more direct attacks, the martial artist may strike with the first knuckles extended, similar to the leopard fist. This draws parallels between Whirlwind Iron Cutting Fist and real-life Leopard Kung Fu. Moreover, the martial artist may extend only their thumb, index, and middle fingers in a clawed fashion similar to the Southern Dragon Kung Fu Fist to produce whirlwinds at a close range.
- Whirlwind Water Stream: Roaring Aura Sky Ripping Fist (旋風流水 轟気空裂拳, Senpū Ryūsui: Gōki Kūretsu-ken): A powerful technique that combines both Whirlwind Iron Cutting Fist and Water Stream Rock Smashing Fist. To perform the technique, Bang and Bomb stand side-by-side and assume strong stances. Both perform their respective martial arts and strike the opponent simultaneously, sending powerful shockwaves through the opponent's body. The technique was powerful enough to knock back a charging Elder Centipede and shatter the monster's carapace. However, as stated by both Bang and Bomb, they can only do this technique once per battle since both of them have passed their prime. Traditionally when the technique connects, the shockwaves created will spread through the victim's entire body, which ultimately reduces the victim to dust.
- 'Whirlwind Water Stream: Cross Fang Dragon Slayer Fist (旋風流水 交牙竜殺拳, Senpū Ryūsui: Kōga Ryūsatsu-ken; Viz: 'Fist of Biting Fangs, Killing Dragons): A combination of the martial arts of Bang and Bomb, even more powerful than Whirlwind Water Stream Roaring Aura Sky Ripping Fist. Both perform extremely powerful strikes at their opponent with their respective martial arts during combat.