paragraph: Suddenly, Amy screamed. I whirled around and threw up my arm just in time to knock Dvorov away. His eyes were glowing red, and he had bared a set of fangs that could probably take my hand off. The dancers near us tried to clear some space. He shot back up, hardly touching the ground, and I kicked him back. He jumped at my arm while I was still off-balance, and I felt the surge of adrenaline that comes right when your body realizes that it’s too late to save itself. A heavy thing hit my arm with a thump and knocked me back against someone with rough paws who held me up. On the floor was Dvorov’s head, separated from his body by several feet and a growing puddle of dark blood. Nepthys stood over him with a blue sword in his hand. It flashed in the strobe where it wasn’t streaked with Dvorov’s blood. “He wasn’t the only one with a secret or two,” he said by way of explanation. “You spotted our boy, didn’t you? I bet his hide-out is nearby, too. Let’s hurry.” He wiped off the sword and sheathed it in a scabbard now belted to his hip. The crowd parted for us. The vampire glanced up when he saw the crowd split and his eyes flashed when he noticed us. In a blink of the strobe light, he was on his feet and dashing from the room. “Come on!” shouted Nepthys. We chased after him, Amy keeping up valiantly behind us. He bashed up a set of stairs set into the side of the wall, and we chased up after him, heading up a huge staircase that seemed to go up for more stories than the building could have held. 
question: Did the same person who screamed kill Dvorov?
answer: No