To add to my Mile High friend's explanation (which is entirely correct); if you were to have a player running down the court decide to step out of bounds to avoid the defense or make the defender chase him, it would be a violation resulting in giving the ball to the defense at the spot he went out of bounds.
If going out of bounds were incidental and accidental (momentum, for example) any foul against that player would fall under normal live ball definitions.
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