I have the demo for that section there, but he left the game just after that. He left because he knows I was watching him. Not many other reasons the top fragger would drop to spec, especially right after he hit a few weird wallbangs on me. I don't see why his first two 'aims' through walls, followed by him stopping right before that guy walks around the corner isn't enough for a ban, but he was, for the most part, good about hiding it. I don't think he will come back to the server in a while, but if he does he won't inject until he knows he's not getting spec'd anymore.
It also doesn't help if he checks the forums and sees this.