You stagger the target with a mental attack, either to provide your ally with a vulnerable target or allow the ally to get away

Encounter   ✦     Implement, Augmentable, Psionic
Standard Action      Ranged 10

Target: One creature

Attack: Primary ability vs. Will

Hit: The target is dazed until the end of your next turn.

Effect: As a free action, one ally adjacent to the target can either take a move action or make a melee basic attack with a +2 power bonus to the attack roll.

Augment 2

Effect: As a free action, two allies adjacent to the target can each either take a move action or make a melee basic attack with a +2 power bonus to the attack roll.

Published in Dark Sun Campaign Setting, page(s) 56.