Cutting the ball in half

what causes this?

1.) Some kind of a saw or sharp tool used to split objects in half

2.) An offscenter grip.

lol

by cutting the ball in half i mean my hand isnt ontop of it it has a 45 degree supination kinda thing goin’ on

technique used when throw a cutter, slider or sinker

with a sinker it is said throw ing the inside half of the ball

like bower said an off center grip thrown with little or no supination/pronation

mariano rivera cuttter
webb, wang, carmona, halladay sinker
steve carltone threw his slider with a off center grip