Here's the official rule:
Section 8. Drop on Recall, Scoring.
A nonqualifying (NQ) score must be given to any dog that does not drop completely to the down position on a single command or signal or to a dog that does not remain down until called or signaled.
Minor or substantial deductions, up to a nonqualifying (NQ) score,
shall be made for delayed or slow response to the handler’s command or signal to drop and for slow response to either of the recalls.
All applicable penalties listed under the Novice Recall shall apply.
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Sounds like the judge was wrong to NQ the dog.
Section 8. Drop on Recall, Scoring.
A nonqualifying (NQ) score must be given to any dog that does not drop completely to the down position on a single command or signal or to a dog that does not remain down until called or signaled.
Minor or substantial deductions, up to a nonqualifying (NQ) score,
shall be made for delayed or slow response to the handler’s command or signal to drop and for slow response to either of the recalls.
All applicable penalties listed under the Novice Recall shall apply.
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Sounds like the judge was wrong to NQ the dog.