You don't have to know it... just adjust to it. A lot of yoyo tricks rely on it. It's just the science...

[Which is a lot more important when you're the one actually building such things than necessarily just using them. He watches her style, keeping in mind the moves she uses.]

Mm.... that's how it is for normal yoyos. Weaponized, the same thing applies, but... with a little more room.