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Sidestep stance
rogue utility 6

Prerequisite: Acrobatics trained

Effect: "Choose one enemy within 5 squares of you that you can see. Until the stance ends, you gain a +2 power bonus to AC against that enemy’s melee attacks and ranged attacks if you can see the enemy. You can choose a new enemy as a minor action."[MP:77]

Sidestep stance is a daily power available to rogues at 6th level.