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The difference is delay vs prevent.
In a delay, the ball is still on the court or along the court in the vicinity of the throwin area where the throwing team could get it with a momentary delay.
In a prevent, the ball is in the stands (or the opposite end of the court) such that the other team would have to take a lot of extra time in order to get the ball....and we really don't want players going into the stands.
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