You retard the target's visual image as it reflects into the timestream. The target's outline appears distorted, jerky, and imprecise. This distortion grants the target a 10 percent miss chance. The miss chance granted by slow light stacks with miss chances granted by other miss-chance effects, such as actual partial concealment, though only by half its value; a target in this situation would possess a 25 percent miss chance.
Foes who cannot see the target ignore the power's effect.