Demo 1
29K - Confrontation before hand, see nothing unusual.
36K - Meh ^ ...
44K - Long wait before fire, he did see him.
45K - Lot of confrontation there, questionable.
45.8K - Wtf? Looks wallish to me.
47K - Wallish...
53K - Walls.
54.5K - I see what your saying but could be coincidence.
59.4K - Yep
66.7K - Walls.

Demo 2
2K - Heard the footsteps, but he stopped before I could hear them. Meh, I also have shit headphones.
11K - Walls
17K - Agreed, the movement and caution around him before the kill, and knowing exactly after.
18.7K - Walls, lined out before smoke.
19.5K - Yerp.
20.3K - "Tracey".
39K - I see what your saying, but meh, enough time to react for a fast player.
43.4K - Noted, like he knows and is waiting.
48.9K - Walls. Daadaaadaaadaboule walls.
62.7K - Seems as he knew the other guy was gonna drop down the tunnel soon, had the flash handy in-case, saw he stopped, resumed to kill. Heh, I'd say walls.

Consistency is far to stretched, to many odd moments, way too much knowing of all surroundings whether there be sounds, no sound, radar, or not. No matter confrontation on going or not, other players locations seem to always be known. Couple that with the minimal tracings and hesitations for no good reason besides "knowing" preemptive, I have to agree that this player is indeed walling. Great catch.