so its not wall scan, (this => streamable.com/dcspn ) ill break it down: He is holding the water tunnel angle as tightly as he can with his crosshair (ie very disciplined aim), but then randomly moving his crosshair off to look at a wall (ie very lazy aim) that would allow him (with a wallhack) to see if anyone is bottom connector. He also looks over at the wall very briefly a few times when no one would show on his screen, but then holds his crosshair for much longer and even seems to react by moving his crosshair even more to the right when the enemy walks on to his screen (if he had a wallhack). You could make the argument that he is looking over to the right to dodge a flash that could come over sewers or just so he can quickly flick back to either the tunnel or connector, but he would be able to easily see and dodge a flash over sewers from that position and since the door makes a noise when it opens and he is in an unexpected angle, it makes way more sense just to watch the tunnel and then move to the door once it opens. After this, he then moves into an angle where he is much more likely to get a kill if they come out of connector since the previous angle the T's have a right eye peak advantage, but is almost completely exposed on the sewer tunnel since the T's would see his feet first. You almost never see top pros playing there without an AWPer watching down the monster tunnel or having already cleared T-spawn (ie never play there without knowing no one would come sewers, which they don't have info on). His HLTV page says he doesn't have a team so I am going to assume he is just playing as a PUG team so I can look past the repositioning and lack of teamwork as a heat of the moment thing since his first position is risky and pretty exposed, and you could argue the moving to the wall and back is to keep his aim 'awake' (similar to the shake Stewie does when just holding angles) and also getting a feel of how far he would have to move his mouse to get from the tunnel to the door. Definitely not how I would play it, but I would also never do the shaky spray like Kjaerbye and he won a major with it so it could just be a quirk he has developed and sticks with.