you said that the rise ball does not rise but, I have pitched ones that go straight level with ground, and then slowed down and climbed. Could explain to me then why you say it just seems to rise?
Throw from below upwards towards the batter with the release point close to the ground. Normally, the ball enters the catcher's mitt in a free fall, but a rise ball is caught without falling, so it appears to be floating. This is just my personal opinion, so please use it as a reference.
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