When one of your allies delivers a telling blow on a foe, you offer encouragement to help your friend finish the fight.

Encounter   ✦     Martial
Immediate Reaction      Ranged 5

Trigger: An ally within 5 squares of you scores a critical hit.

Target: The triggering ally

Effect: The target gains temporary hit points equal to your Charisma modifier.

Published in Player's Handbook, page(s) 146, Class Compendium.