After landing a tremendous blow, you trail your enemy and make it think twice about turning its back on you.

Daily   ✦     Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 4[W] + Strength modifier damage.

Effect: Until the end of the encounter, you can make a melee basic attack against the target as a free action if you are adjacent to it and it either shifts or attacks one of your allies.

Published in Player's Handbook, page(s) 84, Class Compendium.