I have played the demo at regular speed and did not see anything I then slowed it down to even 7% and could not find anything at all. The two type of hacks that could have been used where aimbot or auto fire. It has been concluded that no hacks were used.
Aimbot: This implies that a program is automating the targeting system. As a result it is limited to the way that a program works in that the effects will be apparent when ever it "locks on" this is seen as the aim snaps to the defined target. It becomes very apparent when the user is going to look from one side to another and the speed of the aim slows at the target and then suddenly snaps away. Increase acceleration toward the defined lock point and decreased acceleration away is the mark of well configured aimbot. The users aim speed was consistent at all times and no jerks or snaps were detected. Therefore it can be concluded that no aimbot was used. Also there was no locking of any kind as the user was clearly making human adjustments to the aim after scrolling past the target on multiple occasions which is inconsistent with aimbot.
Auto fire: this is when the gun shoots any time the crosshair passes over the target clearly this hack was not used as there were multiple times when the aim passed over a target and no shots were fired.
As for the last kill I see what you all are saying but it occurred at the end of the round where we know there is strange lag issues sometimes. The demo is only how it looked from the spec but they are not at the same ping as the two players or are able to move back and forth in time like the server does to determine player positions.
The player has been unbanned.