The Inazuma Kick (稲妻かかと割り, Inazuma Kakato Wari, "Lightning Flash Heel Splitter") is one of Ken's Unique Attacks. Introduced in the Street Fighter Alpha series. In the EX games, this acts as his Guard Break in the first two games, and as his Surprise Blow in the third.
Executed by holding backward and pressing medium kick, Ken performs an overhead leading-legged axe kick that hits the opponent two times. This attack is one of the many that can also be performed during any of Ken's unique kick specials in some of the other games, but can also be done as a command normal as well.
However, unlike the Collarbone Breaker, it has much more range while also keeping Ken stationary, allowing him to safely poke at his opponent in-and-out if when spaced properly.