Moving target
rogue attack 29
Requirement: wielding a crossbow, a light blade, or a sling.
Trigger: A creature makes a melee attack or a ranged attack against you
Target: the attacking creature
Attack: Charisma vs. Will
Hit: "Instead of attacking you, the target attacks a creature you choose within 2 squares of you. You must choose a creature that the target can attack."
Miss: "The target’s attack is made against you as normal, but deals half damage if it hits."[PH:126]
Moving target is a daily power available to rogues at 29th level.