think about a perfect sphere moving through air, itll be smooth. now a ball with a scuff on it, the air will push into the scuff and there will be different/unequal air pressures around the ball, causing it to move/spin/rotate. Imagine a pinwheel...air blasting on it equally, it wont really move. Air coming from one side, itll spin in that direction.
Ump says AJ Ellis sucks at pitch framing, gets ejected, rants postgame
Even though the he does suck at it and the ump was probably right, thats pretty damn unprofessional. Call the game at the plate not where the catchers glove is.