Back Slice

From Zelda Wiki.org

The Back Slice is the third Hidden Skill taught to Link by the Hero's Spirit in Twilight Princess. This skill can be used by side jumping, then hitting the Action Button upon landing to roll around the targeted enemy. By pressing the Sword Button at the end of the sidewards roll, Link draws his sword and performs a stab into the enemy's back. This is seemingly one of the most useful Hidden Skills, as it can be used anytime and is one of the fastest ways to attack armored foes.

This technique can also be used when nothing is targeted, but Link will just roll sideways instead of in a semi-circular pattern. Side-jumping then side-rolling repeatedly is the fastest way to travel sideways, but running and rolling forward is still faster, unlike in Ocarina of Time or Majora's Mask.

The Back Slice is nearly identical to the vertical-countering parry in The Wind Waker.

The Back Slice-stage one. In this picture, the soldier demonstrates jumping, and rolling behind an enemy to get to their weak-spot(s).

The Back Slice-stage two. The soldier demonstrates spinning your sword around once you're behind the enemy.