You step in front of an attack meant for your ally and give the attacker a staggering blow. Your friend can then move to a better position.

Encounter   ✦     Martial, Weapon
Immediate Interrupt      Melee 1

Trigger: An adjacent enemy hits an ally with an opportunity attack

Effect: The opportunity attack hits you instead.

Target: The triggering enemy

Attack: Strength vs. AC

Hit: 2[W] + Strength modifier damage, and the ally can shift 2 squares.

Published in Martial Power, page(s) 106.