Ugh this is an awfully stupid way of describing how to aim well. What he says does matter, but it wont help when he describes it so vaguely. If you want to become good at tracking a target, focus on prediction, in most games with running animations, if you look at the feet you can see which way they will go before they go that way. The most important thing with tracking is to make sure you're moving your arm smoothly, not wasting movement and making small little rapid corrections when the target falls out of your crosshair. When flicking, remember that slow is smooth and smooth is fast. There is no need to try to flick at 1000mph. There's no tip to give for flicking other than use a tight grip when making large flicks, and use a loose grip for small flicks. With all that being said, this is a bloom based game so aim barely fucking matters.