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Killer's instinct
rogue utility 22

Trigger: an enemy you can see becomes bloodied

Effect: you shift your speed and must end this shift closer to the triggering enemy. If you end this shift adjacent to the triggering enemy, it grants combat advantage to you until the end of your next turn.[MP2:68]

Killer's instinct is an encounter power available to rogues at 22nd level.

This is rated as an average choice, as the useful effect is dampened by the trigger.[Charop Rogue]