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So you're stating is that the moment his target disappeared behind the column he just so happened to turn to the right, lower his crosshair's position in the process, pass his crosshair over another player with it passing dead center over the middle of the player's head, and that lag captured that exact moment of it being right on the player's head with it ceasing to lag once he was already aiming past him thus creating the illusion of aimlock. 

Compared to him just aimlocking and then shoving his aim away to correct or hide it.

1. If you're fighting 2 people and 1 goes out of view, is it not typical to switch targets? 
2. Nobody moves their mouse perfectly horizontal, move your mouse to the right and your cursor is PROBABLY going to move slightly downward/upward
3. Not sure if you took the time to check cause I said this earlier but it literally lags in the same way on this frame, https://i.gyazo.com/5727727b6829e086e724...767c66.png, where the deagle animation freezes.