Flood infection feat 2

The Captain screamed as a razor-sharp tentacle plunged through both his uniform and his skin, wriggled under the surface of his skin, and tapped his spinal cord. There was an explosion of pain so intense that he blacked out, only to be brought back to consciousness by chemicals the thing had injected into his bloodstream.
(Halo:The Flood; pg.175)

Even as he staggered under the impact, and pawed at the form's slick body, a penetrator punched its way through his neck seal, located his bare skin, and sliced it open. The Spartan gave a cry of pain, felt the tentacle slide down toward his spine, and knew it was over.

Though unable to pick up a weapon and kill the infection form directly, Cortana had other resources, and rushed to use them. Careful not to drain too much power, the AI diverted some energy away from the MJOLNIR armor, and made use of it to create and electrical discharge. The infection form started to vibrate as the electricity coursed through it.
(Halo:The Flood; pg.360 - 361)