OOC: Just think of it as writing a battle in a story where Katrina wins. I'll help a little.
Three Stormtroopers noticed Katrina and opened fire on her.
OOC: ah, I see now. Thanks-
Katrina was glad for the Doctor's shielding, even if she didn't understand it. The shots ineffective, Katrina hurled her sword into the first trooper's gut. The fatal blow toppled the white-armored foe, and in a show of inhuman speed, she closed the distance between them. In but a moment, she was standing over the dying body, ripping the blade free without effort.
By then, she was in range of their weapons. A shot singed the arrogant vampire's shoulder, though it began to heal immediately. "Brisingr!" She barked, hand raised to guide the magic. Instantly, the second Stormtrooper caught fire, and he was forced into an awkward position in which he shot wildly and tried to put himself out. A stray blast hit the third's knee by chance.
With the final foe distracted, Katrina dashed behind him in a blur of movement, snapping his neck nearly 360 degrees. By then, the foe ablaze was burnt beyond recognition and salvation. Katrina smiled victoriously, hungry. "Pathetic! Bring me a real fight!" Although she prevailed, the toll from the potent spell made her brow sweat, which she wiped with her wolfpelt.