My son has been throwing this pitch in games. He uses grip and finger pressure, and tries to throw it like his fastball.
This is one for a strike:
And this would be one in the dirt to get a swinging strike (I didn’t do a very good job catching it):
I just wanted to video it to see how it moves, since it’s been extremely effective as a strike out pitch…he throws hard, and kids have a difficult time adjusting to it. Unfortunately, this pitch also results in a good bit of dropped third strikes, when he throws the second one (down and away).