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One of the fallacies regarding powered armor, and the suit that the woman had donned, was that it gave a particularly large resistance to blunt force trauma. In truth the best way to damage a knight in armor was often blunt force, force that dented the armor and damaged the person behind it. As the superhuman's blow struck the woman, the energy was absorbed, and would seem to have had very little effect on the armor, but caught off guard by the way he had recovered from her plasma blasts the woman was barely unable to avoid the rising knee coming straight for the headpiece of her armor. 

There was a sickening crack as the woman's head made contact with his knee, the armor oddly seeming to bend and indent a great deal, enough that it would seem to indicate that the head inside had been thoroughly pulped before bouncing back. And as the crack sounded the woman went limp. The energy wielding meta-human likely would fear that he had been more successful than he had expected and accidentally killed the target he had been sent to retrieve alive. This misconception would be strengthened as a faintly orange fluid, dripped through the reforming headpiece in a manner that was disturbingly blood like.

But there were rustles after a moment, the woman's hands clenching spasmodically and the sound of faint, if distorted breathing slowly began to sound. What exactly was going on inside the suit was likely uncertain, but it was clear that at least for the moment, she wasn't moving and wasn't a threat.