I was there and in game this looked a whole lot worse than it does on the STV demo. He appears to have some sort of recoil assist. After every group of rounds he shoots, he then gets the recoil just after he stops firing. It is too perfect and rhythmic to be a shaky hand. I made he mistake of watching it slow the first time, watch it at full speed and pay attention to the split second after he stops firing. 3 small bumps on guns that shoot more than one round in quick succession. On the shotgun you see it less clearly because it is only compensating for a single shot.