You make a quick parry on your ally's behalf, take a swift jab at his assailant, and then spin into a new position.

Encounter   ✦     Martial, Weapon
Immediate Interrupt      Melee 1

Trigger: An enemy adjacent to you hits an ally with a melee attack

Target: The triggering enemy

Attack: Strength vs. AC

Hit: 2[W] + Strength modifier damage, and you can shift 2 squares and must end adjacent to the target.

Effect: The ally takes only half damage from the triggering attack.

Published in Martial Power, page(s) 20.