Good catch bbsbvb83!
os, you have to be aware of the definition of an attack.
Per Rule 9-5-1b in the current NFHS Volleyball Rules Book:
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b. Attack — Any action other than a block or a serve that directs the ball toward the opponent's court. A team's third hit is always considered an attack. A completed attack occurs the instant the ball completely crosses the vertical plane of the net, or is legally contacted.
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So, if the Libero directs the ball to the opponent's court from anywhere on the court, as long as the ball is partially below the top of the net, the contact is completely legal.