Either using a hack or a console controller.
You decide.
:troll:
Actually, I could believe he is just "jerking the trigger" by hitting his mouse button hard, and his mouse sensitivity shows that as a little jump from the point he starts to push the button to when he releases it.
I noticed when my blood gets pumping in-game that my shots seemed to jerk like that too. I kept thinking some bug or something was causing it, then I realised I was mashing the mouse button and it would move a tiny bit, and my sensitivity is so high that it showed up on screen as a little jerking motion upwards.
At first I kept trying to stop it, then I realised just how immersive it was and decided to just leave it alone. Basically when I get excited or stressed, I start "jerking the trigger" just like a real guy being shot at might do.
Sure it probably puts me at a disadvantage...but I like being the underdog. It feels better when you win
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Off topic but related: When I first started playing FPS games, I used a standard 3 button mouse. The I met this guy who had a Razor gaming mouse and when he told me how much it cost, I called him nuts. When we played against each other, he didn't seem to be doing any better than me, so I figured he was deluding himself. Then I tried one.
It really is true. Before that I learned to shoot centre mass because I could never be precise enough or quick enough to get snap headshots. After changing, headshots were as easy as anything else. The MOUSE makes a massive difference. If you are having trouble in this or any FPS, and you don't have a proper gaming mouse with something like 2000+ DPI resolution and a much higher update rate than normal, you really don't know just how much advantage people who ARE using them get from them.
They really do make a big difference.