You cut wide with your two weapons, and if the strategy doesn't work, you save it for use later in the fight.

Encounter   ✦     Martial, Reliable, Weapon
Standard Action      Melee weapon

Requirement: You must be wielding two melee weapons.

Target: One creature

Primary Attack: Strength vs. AC (main weapon)

Hit: 2[W] + Strength modifier damage.

Effect: Make a secondary attack against the target.

  Secondary Attack: Strength vs. AC (off-hand weapon)

  Hit: 3[W] + Strength modifier damage.

  Miss: You do not expend this power.

Published in Martial Power 2, page(s) 43.