Happened to run into someone that did this constantly throughout the game. Only way I could only really tell it was coming was because this guy did it all the time, so, he made it predictable.
Best way I could replicate it was by pressing W, then Q immediately after, though pressing Q and W simultaneously produces a similar effect.
With someone who has really good eyes, and yet can't notice this, does make for a slight problem. I'm sure colorblind people or just people with worse eyes than mine would never be able to notice this.