#2 would be for foot faults or center lines.
For a serve under the net, use the net signal.
For any other ball under the net (NFHS), use the "ball in bounds" signal.
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Felix A. Madera
USAV Indoor National / Beach Zonal Referee
FIVB Qualified International Scorer
PAVO National Referee / Certified Line Judge/Scorer
WIAA/IHSA Volleyball Referee
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