At-Will Augmentable, Psionic, Weapon
Immediate Interrupt Melee 1
Trigger: An enemy within 5 squares of you targets an ally with an attack
Effect: Before the attack, you move your speed to a square adjacent to the triggering enemy.
Target: The triggering enemy
Attack: Constitution vs. AC
Hit: 1[W] + Constitution modifier damage.
Effect: You don’t get your normal standard action on your next turn.
Hit: 2[W] + Constitution modifier damage, and you become the target of the triggering attack.
Effect: You get your normal standard action on your next turn.
So, an enemy makes a ranged or area attack. You interrupt with either the unaugmented power or the A2 version (I've elided the A1 version because it's a minor modification on the unaugmented one). You move your speed to a square adjacent to the triggering enemy. Do you also get an OA against the triggering enemy?