User blog comment:JBox2D/Miranda the Dark Emissary/@comment-24036535-20140515213118/@comment-7709681-20140516004351

Even if I agree with you about E's possible permastun must clear up that you misread the tooltip.

The stun endures until either the end of its duration or until the affected target is damaged, and the damage is applied only if the affected target is attacked while stunned, or else won't receive damage.