Samkv : I suspect this player of using wallhax.
So for the first time of my life I tried the SteveMcqueens_Demo_CFG.cfg file so I have been able to look at the demos slowly (and with ennemies in sight behind the walls).
=> You can notice that he focuses his goals before having them in sight.
Either I make a serious mistake (I didn't kick him), or he is a cunning player (which often forgets to reload his weapon ...).
Have a look :