Your senses merge with your ally's until you see things from all perspectives.

Daily   ✦     Psionic
Minor Action      Ranged 5

Target: Two allies you can see or you and one ally you can see

Effect: Until the end of the encounter, whenever the targets are within 5 squares of each other, neither grants combat advantage for being flanked unless both are flanked.

Published in Player's Handbook 3, page(s) 28.