This guy is using wallhack. During my time with him (about 2 matches) i was a little suspicious as I was killed many times by him so quick after exiting cover. One death i had i was shot through a wall a fair distance, and it seemed quite impossible to know i was there exactly, and in the killcam you can see him kill 3 others with spot on accuracy through walls really quick. I record all my matches, its about 5 minutes in, near the end of the demo. If you watch it youlle see it for sure.