Warlord Attack 13Death from Two Sides

You and your ally move into a tactically sound position and attack your foe with a coordinated assault.

Encounter        Martial
Standard Action      Melee weapon

Target: One creature

Effect: You and one ally make a melee basic attack against the target. If both attacks hit, your ally’s attack is a critical hit.

Published in Martial Power 2, page(s) 90.