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It's usually a matter of degree:
If the defense pins the ball in the shooter's hands, it's usually considered a jump ball and possession goes with the alternating arrow. Picture a shooter pushing the ball from below as the defense has a hand firmly on top of the ball preventing the shot.
If the defense hits the ball a glancing blow on the shot preventing the shooter from releasing the ball and the shooter returns to the floor with the ball in his hands, he has traveled. Possession goes to the defense.
If the ball left the shooters hands for even a fraction of a second, there is no violation. That's a rebound.
BTW - There is no such thing as "up and down" just as there is no "over the back."
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