SERAPH-13: Animal Cruelty.

  "...what do you mean you visited my niece in the hospital?  How did you know where to find her?" Elsa exclaimed, coming to a stop.  She was walking with the enigmatic SERAPH agent, 'Ghost', towards the departures terminal where their plane to Islamabad was waiting; Ghost had just come out with this seemingly-random piece of trivia.
  "My second power helped me find her.  It's hard to describe it, but I have a sort of sixth sense that I can use to sense other people with powers; my control is pretty flimsy, but when it starts up it's... I don't know, like my brain is trying to push out of my head; I get a migraine if I don't find--"
  Elsa ran in front of Ghost, making her come to a sudden stop.
  "And you're saying this sixth sense led you to my comatose niece?" she snapped.  Ghost nodded.
  "I looked her over; when Hellfire attacked your niece, a bit of skin tissue or something must've come off his hand and transferred to the wound.  I don't know how the doctors missed it, but it's pretty much grafted into her skin now," Ghost explained.
  "Why is that so bad?  Why would a little of Hellfire's skin left on her face set off your senses?" Elsa asked.  I tried to remember some of the stuff that Anderson had taught me.
  "Most mutants, myself included, get our powers from exposure to Black Matter; such powers cannot be spread through physical contact, as there's no way to pass Black Matter-infected DNA from one person to another without the mutated chemicals becoming inert during host-to-host transit."
  "Is this relevant?" Elsa asked.  Ghost nodded.
  "Hellfire's powers weren't a result of exposure to Black Matter; he was almost atomised from exposure to heavily-irradiated samples of molten rock in his parent's lab in Antarctica.  SERAPH thinks that, if not for the rapid exposure to Antarctica's sub-zero temperatures, he wouldn't have survived."
  Elsa seemed not to understand.
  "The key words in that passage were 'heavily-irradiated'," Ghost said, putting emphasis on the words.  Elsa gasped.
  "So--"
  "Anderson analysed a sample of Hellfire's DNA she got from your sister's apartment; the huge exposure to nuclear radiation has made his genetic structure incredibly unstable..."
  "No," Elsa whispered.
  "...allowing the mutated atoms of his DNA to graft to new hosts via physical contact," Ghost finished.  Elsa's eyes widened, and she began to rush past Ghost; the shorter girl caught Elsa by her arm, holding her in a vice-like grip.
  "I know you want to be with her; but trust me, there's nothing you can do to help her," Ghost said.  She put on a sympathetic expression, but Elsa still tried to fight Ghost's grip.
  "Anderson has SERAPH's top scientists devising a special antibiotic that will kill any infected cells in your niece's body; there's nothing that can be done beyond that."
  "You said it yourself: your boss just wants more mutants!  She'll just let Hannah get mutated, then take her!" Elsa screamed.  Ghost tightened her grip and yanked Elsa back so the two girls were staring each other face-to-face.
  "Anderson may sound cold and ambitious, but she'd never stoop so low as to force something like this onto a girl Hannah's age.  Besides, she's got a good motivator for good behaviour; SERAPH is already in the middle of an Internal Affairs investigation from the government.  She can't afford any more bad press..."

  I latched onto Schäfer's arm with my fangs, tasting blood in my mouth as I stomped him in the groin with one of my rear paws.  He howled in pain and anger, throwing me off him; I righted myself in midair, landing on my feet.
  Blood streaked Schäfer's arm, but he either didn't feel the wound or ignored it; he glared at me with his rage-filled eyes, his gnarled hands bunched into fists.
  "Stupid little dog; I'll snap your neck vit my bare hants!" he snarled.  I growled at him, my hackles lifting and my fur bristling.
  "Don't get your hopes up, Schäfer!" I snapped.  The German froze for a moment, stunned that a wolf, somehow, had the power of speech.  Then his eyes narrowed in anger.
  "You must be vone of dose English mutants, ze vones vit dat ridiculous ZERAPH project!  GaiaTech pays a substantial bonus for proof of killing one of you!" the German hissed.
  I blinked, taking a deep breath that sounded like air being dragged into a massive set of bellows.  A huge jolt ran through my body, like I'd been hit by a bolt of lightning; I swelled like a balloon, growing until I was almost five feet tall at my shoulder.  My muscles bulked up and my paws flattened against the soil, growing longer claws and more flexible digits.  My fur thickened, then grew softer as it went from ash-grey to chocolate-brown.
  I took two thunderous steps forward, rearing up onto my hind legs as I let out a cavernous, moaning roar.  Schäfer, instead of the gape of dismay I expected, wore a contented sneer.  I took another earth-shaking step forward, and roared right at his face.
  "What is the meaning of this?" the alien exclaimed, turning to Schäfer.
  "Zis vill be interesting," was all the German muttered, ignoring him.
  Schäfer charged, putting his arms behind himself and linking his fists, ready for a powerful uppercut.  I came crashed down on all-fours, the shockwave of six-hundred kilograms of Kodiak bear causing Schäfer to almost lose his balance.  I swiped with my massive claws, catching the barest edge of the back of his head as he ducked under the blow; he danced forward, jabbing me right in the snout with his fist.
  The blow was mocking, he'd pulled the punch right at the last second; I bellowed in anger, planting my claws firmly and charging into him.
  Schäfer was caught on my shoulder, my sudden attack winding him; I drove him back-first into the rock face, pinning him under my furry shoulder as I clamped my jaws around his shoulder.  Again, I felt the coppery tang of blood in my mouth and heard the German cry out with pain.
  I grunted as I felt his hand hook behind my head before he yanked my head forward, smashing my snout against the rock face; I instinctively roared in pain, accidentally releasing my grip on Schäfer.  The German punished the opening, putting his knees together and ramming them into my throat; as my head was driven up by the impact he brought his elbow down, driving me right between the eyes.
  My vision swam and my stomach lurched; dazed, I could do nothing but stumble backwards under a devastating rain of punches and kicks.  Schäfer worked with mechanical precision, targeting joints and fleshy points to maximise my pain; each blow sapped my strength as my body's advanced healing factor automatically went to work on healing my injuries, rather than maintaining my form...
  Then Schäfer ended it.
  He hooked his hand under my jaw, tightening his grip like a vice, before yanking up hard; I was forced onto my hind legs, the sudden rush of vertigo almost making me overbalance.  He sprang into the air so that he was level with my chest, before striking out with a two-footed kick that felt as hard as being hit by a runaway train.
  Three of my ribs broke; two more fractured.  That was just the damage from the kick itself.
  The impact with the granite outcrop behind me was where the real damage was done.
  I crumpled to the ground, a breathless and broken mess; my flanks were stained with blood and fur was matted with sweat, and every breath was a ragged gasp down my muzzle.  I couldn't feel anything below my stomach, and everything above it was like I had molten lead in my veins and broken glass instead of bones.
  With every gasp I exhaled, I shrank a little.  Schäfer loomed over me, smirking as I shrank further and further.  My front paws lost their claws, the stumpy digits lengthening back into fingers.  My neck thinned out as my broken skeleton did its best to resume my human form; I felt like all my bones had been replaced with knives, each one slashing at my flesh as they struggled to rearrange.  I wanted to scream, but my lungs were collapsed; breathing was enough of a feat.
  "I expected more from one of de infamous ZERAPHs; I confess, I am disappointed," Schäfer sneered.  He lifted his boot and placed it on top of my head, preparing to crush my skull against the granite.
  "You vere barely vorth ze effort..."
  SMACK!
  From under Schäfer's boot, I saw the alien; he had moved in during the commotion, and had his silver gauntlet wrapped around Schäfer's arm.  The expression on his face was a deathly mask of rage and disgust; I saw Schäfer pale slightly.
  "I have seen your soul, the violence in your heart; compared to the heart in this child, yours is as foul as a Kaborean sewer.  You are a sickness to this world and its people..."
  WHAM!
  The alien drove his knee into Schäfer's gut, bending the old German over.  Schäfer roared in anger, jabbing the alien in his eye; the alien rolled with the impact, hitting the Nazi in the ribs with a roundhouse.
  "...a sickness that I will cure!" the alien snarled.
  "You can try!" the German spat back.
  The alien launched another roundhouse, hitting Schäfer in the other side.  Schäfer snarled at the pain of the impact, wrapping his arm around the alien's shin, pinning it against his side; he drew the alien closer, hitting him twice in the face...
  SHIIIIII-VWOOOOOOOMMMM!!!!!!!!!!!  The alien's armour blazed to life with the intensity of the afternoon sun, and Schäfer was sent flying by a shockwave of blazing amber light.  The energy washed over me, bombarding me like a hurricane wind; rather than the pain I was expecting, however, there was a warmth that flowed through my body; my strength came back in full-force, and I felt my broken bones and torn muscle knit back together painlessly.
  "Wow!" I gasped, leaping to my feet with such vigour that I let out a lion-like roar in place of a cheer.
  "I did on purpose, to help you; I caught that man by surprise, but I'm not strong enough to beat him alone," the alien said as he walked over to me.  He swept a blonde lock out of his face.
  "If you can distract him for a few minutes, I can take a new form that'll tear this guy to shreds!" I said, grinning savagely at the thought.
  "He'll have been rejuvenated by that blast as well.  How long must I distract him, exactly?"
  "How long is a piece of string?" I replied drily.  The alien frowned, clearly unfamiliar with this metaphor.
  "I don't know; no more than five minutes," I hastily replied.  The alien nodded; I frowned, deciding to stop calling him just "the alien."
  "I'm Tyler," I said.  The alien nodded, rapping his chestplate with his knuckles.
  "Saris," he replied.
  "Zere vill be time for makink each ozzer's acquaintance later..!" Schäfer shouted as he mounted the top of the boulder he'd been thrown over.  We both turned, fists raised; I gritted my teeth, which had lengthened into slight fangs without my knowledge.
  "...AFTER I GIVE YOU BOTH YOUR ONE VAY TRIP TO ZE AFTERLIFE!!!"